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 A024295 #14 Apr 02 2017 15:37:21
%S A024295 0,1,-10,288,-16656,1629440,-242569728,51150403584,-14514466195456,
%T A024295 5334038568566784,-2464645606175539200,1398530065161670098944,
%U A024295 -956068708752272063987712,775009022325905883458961408,-735038625130292891682693185536
%N A024295 Expansion of log(1+tanh(x)*x)/2.
%t A024295 With[{nn=30},Take[CoefficientList[Series[Log[1+Tanh[x]*x]/2,{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Mar 04 2013 *)
%Y A024295 Cf. A009399.
%K A024295 sign
%O A024295 0,3
%A A024295 _R. H. Hardin_
%E A024295 Extended with signs Mar 1997