A210438 G.f.: Sum_{n>=0} x^n * Product_{k=1..n} (k^2 + x) / (1 + k^2*x + x^2).
1, 1, 4, 20, 174, 2262, 40894, 980590, 30095022, 1149982990, 53521460958, 2980006437662, 195562339712590, 14936971352026094, 1313606920832545022, 131776096083434471678, 14956389843996883667182, 1906794751364126563388238, 271321222225812454677233694
Offset: 0
Keywords
Examples
G.f.: A(x) = 1 + x + 4*x^2 + 20*x^3 + 174*x^4 + 2262*x^5 + 40894*x^6 +... where A(x) = 1 + x*(1+x)/(1+x+x^2) + x^2*(1+x)*(4+x)/((1+x+x^2)*(1+4*x+x^2)) + x^3*(1+x)*(4+x)*(9+x)/((1+x+x^2)*(1+4*x+x^2)*(1+9*x+x^2)) + x^4*(1+x)*(4+x)*(9+x)*(16+x)/((1+x+x^2)*(1+4*x+x^2)*(1+9*x+x^2)*(1+16*x+x^2)) +...
Links
- Vaclav Kotesovec, Table of n, a(n) for n = 0..220
Programs
-
PARI
{a(n)=polcoeff( sum(m=0, n, x^m*prod(k=1, m, (k^2+x)/(1+k^2*x+x^2 +x*O(x^n))) ), n)} for(n=0, 30, print1(a(n), ", "))
Formula
a(n) ~ 2^(2*n+5) * n^(2*n+5/2) / (exp(2*n) * Pi^(2*n+3/2)). - Vaclav Kotesovec, Nov 02 2014
Comments