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 A024256 #22 Apr 02 2017 15:30:43
%S A024256 0,1,-4,63,-2124,123125,-10909530,1370980527,-231929847352,
%T A024256 50819745007593,-14001213054748470,4737203637126866147,
%U A024256 -1930988440489283869716,933336022674019405298013,-527815626641210525156467474
%N A024256 Expansion of log(1+sinh(x)*x)/2.
%F A024256 E.g.f. of aerated sequence: Sum(n>=0, a(n)*x^(2*n)/(2*n)!) = log(1+sinh(x)*x)/2.
%p A024256 S:= series(log(1+sinh(x)*x)/2, x, 101):
%p A024256 seq(coeff(S,x,2*j)*(2*j)!, j=0..50); # _Robert Israel_, Jun 29 2015
%t A024256 With[{nn=40},Take[CoefficientList[Series[Log[1+Sinh[x]*x]/2,{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Oct 14 2011 *)
%Y A024256 Cf. A009360.
%K A024256 sign
%O A024256 0,3
%A A024256 _R. H. Hardin_
%E A024256 Extended with signs Mar 1997