A321377 Expansion of Product_{1 < i <= j} (1 - x^(i*j)).

1, 0, 0, 0, -1, 0, -1, 0, -1, -1, 0, 0, -1, 1, 1, 0, 1, 1, 1, 1, 2, 1, 3, 0, 2, -1, 1, 0, 1, -1, -2, -2, -3, 0, -3, -4, -3, -4, -6, 1, -6, -1, -4, -2, 0, 0, -2, 2, 1, 1, 1, 6, 5, 6, 8, 7, 8, 8, 9, 9, 9, 8, 11, 0, 6, 6, 7, 3, 6, -10, 1, -7, -6, -7, -6, -18, -10, -21, -13, -14

Offset: 0

Author

Seiichi Manyama, Nov 08 2018

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..10000

Crossrefs

Convolution inverse of A182270.

Cf. A038548, A211857, A321299, A321376.

Formula

G.f.: Product_{k>0} (1 - x^k)^(A038548(k) - 1).