OFFSET
0,6
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..1000
FORMULA
G.f.: (Sum_{k>=0} x^(9*k)/(Product_{j=1..k} 1 - x^(4*j))^3)/(Product_{j>=0} 1 - x^(4*j+1)). - Andrew Howroyd, Sep 16 2019
PROG
(PARI) seq(n)={Vec(sum(k=0, n\9, x^(9*k)/prod(j=1, k, 1 - x^(4*j) + O(x*x^n))^3)/prod(j=0, n\4, 1 - x^(4*j+1) + O(x*x^n)))} \\ Andrew Howroyd, Sep 16 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved