128900

Appears in sequences

• G.f.: Sum_{k>=0} x^(k^2) * Product_{j=1..k} ((1 + x^j)/(1 - x^j))^2.at n=31A376854
• Expansion of g^2/(1 + x^2*g^2), where g = 1+x*g^4 is the g.f. of A002293.at n=7A391455