A293287 - OEIS

%I #12 Oct 06 2017 18:33:17

%S 1,-1,-2,3,-1,-5,9,3,-20,16,20,-54,19,89,-123,-56,287,-181,-383,748,

%T 37,-1520,1406,1619,-4439,1190,7768,-10102,-5494,25673,-14754,-36660,

%U 66367,7047,-139852,125785,153573,-405349,98671,712275,-909382,-514965,2332540,-1303341

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

%H Seiichi Manyama, <a href="/A293287/b293287.txt">Table of n, a(n) for n = 0..500</a>

%F Convolution inverse of A293204.

%o (PARI) Vec(prod(m=1, 50, 1/(1 + x^m + 2!*x^(2*m))) + O(x^50)) \\ _Michel Marcus_, Oct 05 2017

%Y Column k=2 of A293285.

%Y Cf. A293204.

%K sign

%O 0,3

%A _Seiichi Manyama_, Oct 04 2017