oo ____ \ ` \ 2 \ n n ) ----------*x / n / 3 *(n + 1) /___, n = 1
Sum((n^2/((3^n*(n + 1))))*x^n, (n, 1, oo))
/ / 4*x / x\\ | | -2 + --- 18*log|1 - -|| | | 3 \ 3/| |x*|--------------- - -------------| | | 2 3 2 | | | 2*x x x x | | |- ---- + - + -- | | \ 9 3 27 / |x| |----------------------------------- for --- < 1 | 6 3 < | oo | ____ | \ ` | \ -n 2 n | \ 3 *n *x | / --------- otherwise | / 1 + n | /___, | n = 1 \
Piecewise((x*((-2 + 4*x/3)/(-2*x^2/9 + x/3 + x^3/27) - 18*log(1 - x/3)/x^2)/6, |x|/3 < 1), (Sum(3^(-n)*n^2*x^n/(1 + 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