A290395 G.f.: Product_{m>0} 1/(1 + x^m + 2*x^(2*m) + 3*x^(3*m)).

1, -1, -2, 0, 5, 1, -12, -3, 31, 13, -64, -57, 139, 164, -285, -458, 560, 1217, -950, -3176, 1396, 7786, -1129, -18607, -2378, 43043, 17680, -96655, -67957, 208061, 217269, -429510, -628868, 836424, 1710935, -1497065, -4434111, 2294633, 11061661, -2348910

Offset: 0

Author

Seiichi Manyama, Oct 06 2017

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..500

Crossrefs

Column k=3 of A290217.

Programs

PARI

m = 30; Vec(prod(k=1, m, 1/(1 + x^k + 2*x^(2*k) + 3*x^(3*k))) + O(x^m)) \\ Michel Marcus, Oct 07 2017