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 A007301 M2296 #21 Dec 22 2018 12:27:52
%S A007301 1,1,-3,-3,217,-2951,5973,1237173,-52635599,1126610929,20058390573,
%T A007301 -3920482183827,256734635981833,-8529964147714967,-383670903748980603,
%U A007301 99786978811973617701,-10380441423510120242591,594094494902602207843297
%N A007301 From expansion of exp(sin x).
%D A007301 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%F A007301 a(n) = A002017(2n).
%t A007301 With[{nn=40},Take[CoefficientList[Series[Exp[Sin[x]],{x,0,nn}],x] Range[ 0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Dec 22 2018 *)
%K A007301 sign,easy
%O A007301 0,3
%A A007301 _N. J. A. Sloane_
%E A007301 Extended with signs by _Christian G. Bower_, Oct 1998