n _______ \ ` \ / _______\ \ | / 2 | \ | / pi | \ sin| / ---*n | \ \\/ 4 / ) ----------------- / _______ / / 2 / / pi / / ---*n / \/ 4 /______, n = 1
Sum(sin(sqrt((pi^2/4)*n))/sqrt((pi^2/4)*n), (n, 1, n))
n _____ \ ` \ / ___\ \ |pi*\/ n | \ 2*sin|--------| ) \ 2 / / --------------- / ___ / pi*\/ n /____, n = 1
Sum(2*sin(pi*sqrt(n)/2)/(pi*sqrt(n)), (n, 1, n))
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