A321447 Expansion of Product_{0 < i < j < k} (1 - x^(i^2 + j^2 + k^2)).

1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, -1, 0, 0, -1, -1, 0, 0, 0, 0, 0, 0, 0, -1, 0, 1, -1, -1, 1, 1, -1, -1, 1, 0, 0, 0, 1, 1, -1, -1, 2, 2, 0, 0, 2, 1, -1, -1, 2, 2, -1, 0, 4, 3, -3, 0, 4, 2, 0, 0, 3, 3, -2, -2, 4, 4, -3, 0, 7

Offset: 0

Author

Seiichi Manyama, Nov 09 2018

Keywords

• sign

Crossrefs

Cf. A025442, A320332, A321448.

Formula

G.f.: Product_{k>0} (1 - x^k)^A025442(k).