OFFSET
0,2
COMMENTS
a(n) > 0 for n >= 0.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
FORMULA
G.f.: theta_3(q) * theta_3(q^2) * theta_3(q^3) * theta_3(q^4).
MATHEMATICA
CoefficientList[Series[Product[EllipticTheta[3, 0, q^k], {k, 1, 4}], {q, 0, 70}], q] (* G. C. Greubel, Oct 29 2018 *)
PROG
(PARI) q='q+O('q^70); Vec(prod(k=1, 4, eta(q^(2*k))^5/(eta(q^k)* eta(q^(4*k)))^2 )) \\ G. C. Greubel, Oct 29 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Oct 06 2018
STATUS
approved