A319734 Expansion of Product_{0 < i < j} (1 + x^(i^2 + j^2)).

1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 2, 1, 1, 1, 1, 3, 1, 1, 1, 2, 3, 1, 2, 2, 3, 3, 2, 4, 3, 3, 4, 3, 5, 3, 3, 6, 5, 6, 4, 6, 8, 6, 6, 7, 8, 9, 7, 8, 10, 10, 12, 10, 12, 13, 11, 15, 15, 14, 15, 14, 20, 19, 16, 21, 20, 25, 22, 22, 27

Offset: 0

Author

Seiichi Manyama, Nov 09 2018

Keywords

• nonn

Crossrefs

Cf. A025441, A321435, A320332, A321444, A321445.

Formula

G.f.: Product_{k>0} (1 + x^k)^A025441(k).