A293294 G.f.: Product_{m>0} 1/(1 - x^m + 2!*x^(2*m)).

1, 1, 0, -1, -1, 3, 3, -1, -8, -8, 12, 24, 5, -43, -55, 40, 137, 65, -215, -356, 97, 780, 624, -941, -2199, -260, 4052, 4638, -3536, -12861, -5676, 19858, 31449, -8337, -71220, -54243, 87733, 196679, 20733, -372807, -413794, 330731, 1159718, 497517, -1821469

Offset

0,6

Links

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

Formula

Convolution inverse of A293072.

Prog

(PARI) nn = 50; Vec(prod(m=1, nn, 1/(1 - x^m + 2*x^(2*m))) + O(x^nn)) \\ Michel Marcus, Oct 05 2017

Crossrefs

Column k=2 of A293293.

Cf. A293072.

Sequence in context: A124040 A248976 A160332 * A200342 A181330 A350253

Adjacent sequences: A293291 A293292 A293293 * A293295 A293296 A293297

Keyword

sign

Author

Seiichi Manyama, Oct 05 2017

Status

approved