OFFSET
1,19
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
G.f. sum(n>=2, x^(n^2-1)/prod(k=1,n-2,1-x^(2*k))) - Joerg Arndt, Jan 29 2011
a(n) ~ exp(Pi*sqrt(n/6)) / (2^(15/4) * 3^(1/4) * n^(3/4)). - Vaclav Kotesovec, Oct 09 2018
PROG
(PARI)
N=99; x='x+O('x^N);
t=sum(n=2, N, x^(n^2-1)/prod(k=1, n-2, 1-x^(2*k))); /* == x^3 + x^8 + x^10 + ... */
v=Vec(t) /* show terms for n>=3 */ /* Joerg Arndt, Jan 29 2011 */
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved