oo ____ \ ` \ |1 - x| \ ------- / x / 2 + 1 /___, n = 1
Sum(|1 - x|/(2^x + 1), (n, 1, oo))
oo*|-1 + x| ----------- x 1 + 2
oo*|-1 + x|/(1 + 2^x)
x^n/n
(x-1)^n
1/2^(n!)
n^2/n!
x^n/n!
k!/(n!*(n+k)!)
csc(n)^2/n^3
1/n^2
1/n^4
1/n^6
1/n
(-1)^n
(-1)^(n + 1)/n
(n + 2)*(-1)^(n - 1)
(3*n - 1)/(-5)^n
(-1)^(n - 1)*n/(6*n - 5)
(-1)^(n + 1)/n*x^n
(3*n - 1)/(-5)^n