find $\sum_{n=0}^{\infty}n^2 x^n$
1379
Summation of $n^2x^n$ terms
59485
Infinite Series: $\sum_{n=1}^\infty \frac{1}{2^nn}$
94943
Sum of series with addition: $\sum_{n=1}^\infty \frac{1}{n^2(n+1)}$
141390
Closed form for $\sum_{n=-\infty}^\infty \frac{1}{(z+n)^2+a^2}$
118456
Find $\sum_{n=1}^{\infty}\tan^{-1}\frac{2}{n^2}$
4253
How to calculate: $\sum_{n=1}^{\infty} n a^n$
32866
How find this sum $\sum\limits_{n=0}^{\infty}\frac{1}{(3n+1)(3n+2)(3n+3)}$
326
Find $\sum_{k=1}^{\infty}\frac{1}{2^{k+1}-1}$
99843
How to simplify $ \sum_{k=0}^{\infty} \binom{k + r - 1}{k} x^k$
84335
Solving for $\sum_{n = 1}^{\infty} \frac{n^3}{8^n}$?
141978
How to find the infinite sum
72502
Evaluate $\sum_{n=1}^\infty nx^{n-1}$
88973
How do you calculate this sum $\sum_{n=1}^\infty nx^n$?
36674
Summation of series $\sum_{n=1}^\infty \frac{n^a}{b^n}$?
117863
Series $\sum_{n=1}^\infty \frac{n^n}{(n!)^2}$
22657
How to find the sum of the infinite series?
77519
I'm searching for the formula of the series $ \sum_{n=0}^{\infty}a^{n^l} $