oo ____ \ ` \ n n \ --*x / n / 3 /___, n = -1
Sum((n/3^n)*x^n, (n, -1, oo))
/ -3 |x| | --- for --- < 1 | x 3 | | oo < ___ | \ ` | \ -n n | / n*3 *x otherwise | /__, \n = -1
Piecewise((-3/x, |x|/3 < 1), (Sum(n*3^(-n)*x^n, (n, -1, oo)), True))
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