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 A293141 #18 Oct 02 2017 02:42:33
%S A293141 1,-1,-1,0,0,0,180,0,10080,90720,0,0,179625600,-1556755200,
%T A293141 -10897286400,326918592000,-2615348736000,-88921857024000,
%U A293141 800296713216000,-30411275102208000,152056375511040000,0,-351250227430502400000,-3231502092360622080000
%N A293141 E.g.f.: Product_{m>0} (1 - x^m + x^(2m)/2).
%H A293141 Seiichi Manyama, <a href="/A293141/b293141.txt">Table of n, a(n) for n = 0..449</a>
%p A293141 N:= 30: # to get a(0)..a(N)
%p A293141 P:= mul(1-x^m+x^(2*m)/2, m=1..N):
%p A293141 seq(coeff(P,x,n)*n!, n=0..N); # _Robert Israel_, Oct 01 2017
%Y A293141 Column k=2 of A293139.
%Y A293141 Cf. A293138.
%K A293141 sign
%O A293141 0,7
%A A293141 _Seiichi Manyama_, Oct 01 2017