added explicit cases ``n=1,2,3`` in ``swinnerton_dyer_poly``
added explicit cases ``n=1,2,3`` in ``swinnerton_dyer_poly``

sunny94/temp,sunny94/temp,sunny94/temp,liangjiaxing/sympy,shikil/sympy,iamutkarshtiwari/sympy,asm666/sympy,abloomston/sympy,saurabhjn76/sympy,saurabhjn76/sympy,mcdaniel67/sympy,Davidjohnwilson/sympy,hargup/sympy,AunShiLord/sympy,kevalds51/sympy,garvitr/sympy,Titan-C/sympy,yukoba/sympy,Vishluck/sympy,AkademieOlympia/sympy,lidavidm/sympy,debugger22/sympy,rahuldan/sympy,grevutiu-gabriel/sympy,abhiii5459/sympy,Sumith1896/sympy,kumarkrishna/sympy,yukoba/sympy,wanglongqi/sympy,kevalds51/sympy,VaibhavAgarwalVA/sympy,beni55/sympy,Shaswat27/sympy,liangjiaxing/sympy,hargup/sympy,toolforger/sympy,ChristinaZografou/sympy,wyom/sympy,chaffra/sympy,Arafatk/sympy,madan96/sympy,saurabhjn76/sympy,ahhda/sympy,Titan-C/sympy,oliverlee/sympy,ahhda/sympy,kaushik94/sympy,MechCoder/sympy,moble/sympy,atsao72/sympy,Davidjohnwilson/sympy,jaimahajan1997/sympy,iamutkarshtiwari/sympy,debugger22/sympy,dqnykamp/sympy,Mitchkoens/sympy,Gadal/sympy,jbbskinny/sympy,atreyv/sympy,Arafatk/sympy,drufat/sympy,ga7g08/sympy,emon10005/sympy,meghana1995/sympy,kaichogami/sympy,kmacinnis/sympy,Sumith1896/sympy,AunShiLord/sympy,shikil/sympy,bukzor/sympy,vipulroxx/sympy,Arafatk/sympy,yashsharan/sympy,MridulS/sympy,sahmed95/sympy,MridulS/sympy,bukzor/sympy,sahilshekhawat/sympy,meghana1995/sympy,kumarkrishna/sympy,Vishluck/sympy,pbrady/sympy,skidzo/sympy,sampadsaha5/sympy,Vishluck/sympy,sahmed95/sympy,drufat/sympy,atsao72/sympy,Curious72/sympy,MridulS/sympy,kaushik94/sympy,jbbskinny/sympy,Curious72/sympy,kaichogami/sympy,garvitr/sympy,jbbskinny/sympy,beni55/sympy,farhaanbukhsh/sympy,chaffra/sympy,moble/sympy,skidzo/sympy,abhiii5459/sympy,cswiercz/sympy,drufat/sympy,grevutiu-gabriel/sympy,mcdaniel67/sympy,madan96/sympy,atsao72/sympy,meghana1995/sympy,sampadsaha5/sympy,souravsingh/sympy,souravsingh/sympy,grevutiu-gabriel/sympy,diofant/diofant,garvitr/sympy,Designist/sympy,rahuldan/sympy,wyom/sympy,debugger22/sympy,moble/sympy,ChristinaZografou/sympy,asm666/sympy,shipci/sympy,MechCoder/sympy,pandeyadarsh/sympy,postvakje/sympy,sahilshekhawat/sympy,iamutkarshtiwari/sympy,MechCoder/sympy,AunShiLord/sympy,ga7g08/sympy,kevalds51/sympy,yashsharan/sympy,lidavidm/sympy,chaffra/sympy,atreyv/sympy,aktech/sympy,mafiya69/sympy,mafiya69/sympy,shipci/sympy,VaibhavAgarwalVA/sympy,wyom/sympy,asm666/sympy,maniteja123/sympy,toolforger/sympy,VaibhavAgarwalVA/sympy,aktech/sympy,cccfran/sympy,jerli/sympy,lindsayad/sympy,cccfran/sympy,kmacinnis/sympy,farhaanbukhsh/sympy,ga7g08/sympy,souravsingh/sympy,shipci/sympy,farhaanbukhsh/sympy,Gadal/sympy,pbrady/sympy,yukoba/sympy,bukzor/sympy,vipulroxx/sympy,pandeyadarsh/sympy,oliverlee/sympy,mcdaniel67/sympy,dqnykamp/sympy,maniteja123/sympy,lindsayad/sympy,hargup/sympy,abloomston/sympy,abloomston/sympy,ChristinaZografou/sympy,skirpichev/omg,kaushik94/sympy,sahilshekhawat/sympy,Titan-C/sympy,Designist/sympy,jamesblunt/sympy,jaimahajan1997/sympy,dqnykamp/sympy,Davidjohnwilson/sympy,vipulroxx/sympy,jamesblunt/sympy,Shaswat27/sympy,madan96/sympy,shikil/sympy,Gadal/sympy,cswiercz/sympy,AkademieOlympia/sympy,hrashk/sympy,toolforger/sympy,Sumith1896/sympy,rahuldan/sympy,skidzo/sympy,Mitchkoens/sympy,Mitchkoens/sympy,jamesblunt/sympy,Shaswat27/sympy,mafiya69/sympy,ahhda/sympy,lindsayad/sympy,oliverlee/sympy,hrashk/sympy,beni55/sympy,lidavidm/sympy,liangjiaxing/sympy,kumarkrishna/sympy,kaichogami/sympy,abhiii5459/sympy,pandeyadarsh/sympy,aktech/sympy,jaimahajan1997/sympy,yashsharan/sympy,emon10005/sympy,postvakje/sympy,cswiercz/sympy,emon10005/sympy,maniteja123/sympy,jerli/sympy,kmacinnis/sympy,jerli/sympy,AkademieOlympia/sympy,Curious72/sympy,sampadsaha5/sympy,atreyv/sympy,Designist/sympy,wanglongqi/sympy,sahmed95/sympy,cccfran/sympy,hrashk/sympy,pbrady/sympy,postvakje/sympy,wanglongqi/sympy