OFFSET
0,4
FORMULA
G.f.: Product_{k>0} ((1-x^(5*k-2)) * (1-x^(5*k-3)))^3 / ((1-x^k) * (1-x^(5*k))).
PROG
(PARI) my(N=50, x='x+O('x^N)); Vec(1/sum(k=-N, N, x^(2*k)/(1-x^(5*k+2))))
(PARI) my(N=50, x='x+O('x^N)); Vec(prod(k=1, N, ((1-x^(5*k-2))*(1-x^(5*k-3)))^3/((1-x^k)*(1-x^(5*k)))))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jul 29 2024
STATUS
approved