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 A012092 #6 Mar 12 2016 14:34:37
%S A012092 1,0,4,-32,1936,-67328,4140096,353591808,-262064131840,
%T A012092 130347373404160,-65058714844462080,36397620373403361280,
%U A012092 -23130160076947953643520,16791590408623398030868480
%N A012092 sinh(arcsin(arctan(x)))=x+4/5!*x^5-32/7!*x^7+1936/9!*x^9-67328/11!*x^11...
%t A012092 With[{nn=30},Take[CoefficientList[Series[Sinh[ArcSin[ArcTan[x]]],{x,0,nn}],x] Range[0,nn-1]!,{2,-1,2}]] (* _Harvey P. Dale_, Mar 12 2016 *)
%K A012092 sign
%O A012092 0,3
%A A012092 Patrick Demichel (patrick.demichel(AT)hp.com)