This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A293294 #12 Oct 06 2017 18:33:07
%S A293294 1,1,0,-1,-1,3,3,-1,-8,-8,12,24,5,-43,-55,40,137,65,-215,-356,97,780,
%T A293294 624,-941,-2199,-260,4052,4638,-3536,-12861,-5676,19858,31449,-8337,
%U A293294 -71220,-54243,87733,196679,20733,-372807,-413794,330731,1159718,497517,-1821469
%N A293294 G.f.: Product_{m>0} 1/(1 - x^m + 2!*x^(2*m)).
%H A293294 Seiichi Manyama, <a href="/A293294/b293294.txt">Table of n, a(n) for n = 0..500</a>
%F A293294 Convolution inverse of A293072.
%o A293294 (PARI) nn = 50; Vec(prod(m=1, nn, 1/(1 - x^m + 2*x^(2*m))) + O(x^nn)) \\ _Michel Marcus_, Oct 05 2017
%Y A293294 Column k=2 of A293293.
%Y A293294 Cf. A293072.
%K A293294 sign
%O A293294 0,6
%A A293294 _Seiichi Manyama_, Oct 05 2017