OFFSET
0,6
FORMULA
G.f.: Product_{k>0} (1-x^(5*k-1)) * (1-x^(5*k-4)) / (1-x^(5*k))^2.
PROG
(PARI) my(N=60, x='x+O('x^N)); Vec(1/sum(k=-N, N, x^k/(1-x^(5*k+2))))
(PARI) my(N=60, x='x+O('x^N)); Vec(prod(k=1, N, (1-x^(5*k-1))*(1-x^(5*k-4))/(1-x^(5*k))^2))
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Jul 29 2024
STATUS
approved