Sum involving Harmonic numbers and binomial coefficients
109599
A finite sum involving the binomial coefficients and the harmonic numbers
110975
Summation of reciprocals
70248
Closed-form expression for $\sum_{k=0}^n\binom{n}kk^p$ for integers $n,\,p$
45862
Nested sum of binomial coefficient in closed form
143945
Summation of combination of binomial coefficient
19581
$\sum_{k=0}^n (-1)^k \binom{n}{k}^2$ and $\sum_{k=0}^n k \binom{n}{k}^2$
130945
Summation using residues
18814
Sum of the series $1+\frac{1\cdot 3}{6}+\frac{1\cdot3\cdot5}{6\cdot8}+\cdots$
113713
Closed formula for the sum of the following series
133420
Computing the binomial series: $\binom{n}{2}\cdot2^2+\binom{n}{4}\cdot2^4+\binom{n}{6}\cdot2^6+\cdots+ \binom{n}{n}\cdot2^n$
96945
General formula of $\sum_{n\ge1}{\binom{2n}{n}^{-k}}$.
18064
Sum of reciprocals of numbers with certain terms omitted
143365
Is $\sum_{i=1}^{n-1}i=\binom{n}{2}$?
103347
combinatorial proof of summation
121554
Finding $\sum\frac{1}{2^n(n+1)}$
114414
Sum of $\sum_{k=1}^n\sin{k\theta}$
131468
Summation of Central Binomial Coefficients divided by even powers of $2$