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 A293300 #14 Oct 06 2017 18:32:54
%S A293300 1,-1,0,-6,24,-120,720,-5040,80640,-725760,7257600,-79833600,
%T A293300 1437004800,-18681062400,261534873600,-5230697472000,104613949440000,
%U A293300 -1778437140480000,32011868528640000,-729870602452992000,17030314057236480000,-408727537373675520000
%N A293300 E.g.f.: Product_{m>0} 1/(1 + x^m).
%H A293300 Seiichi Manyama, <a href="/A293300/b293300.txt">Table of n, a(n) for n = 0..446</a>
%F A293300 a(n) = n! * A081362(n).
%o A293300 (PARI) nn = 30; x = 'x + O('x^nn); Vec(serlaplace(prod(m=1, nn, 1/(1 + x^m )))) \\ _Michel Marcus_, Oct 05 2017
%Y A293300 Column k=1 of A293299.
%Y A293300 Cf. A081362.
%K A293300 sign
%O A293300 0,4
%A A293300 _Seiichi Manyama_, Oct 05 2017