OFFSET
0,7
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
Eric Weisstein's World of Mathematics, Bailey Mod 9 Identities
FORMULA
G.f.: Product_{k>0} (1-x^(9*k-2)) * (1-x^(9*k-7)) / ( (1-x^(9*k-3)) * (1-x^(9*k-6)) ). - Seiichi Manyama, Oct 14 2019
EXAMPLE
G.f.: 1 - q^2 + q^3 - q^5 + 2*q^6 - q^7 - 2*q^8 + 3*q^9 - q^10 + ...
PROG
(PARI) N=66; x='x+O('x^N); Vec(prod(k=1, N, (1-x^(9*k-2))*(1-x^(9*k-7))/((1-x^(9*k-3))*(1-x^(9*k-6))))) \\ Seiichi Manyama, Oct 14 2019
CROSSREFS
KEYWORD
sign
AUTHOR
Eric W. Weisstein, Mar 09 2005
STATUS
approved