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 A012697 #6 Dec 08 2019 18:37:21
%S A012697 1,0,2,-3,28,-110,1058,-6804,75024,-664488,8456712,-94737720,
%T A012697 1378535112,-18587872368,305610292752,-4802794952760,88232994448128,
%U A012697 -1580181612876864,32119507894881216,-644756418530970624
%N A012697 Expansion of e.g.f.: exp(arctanh(x)*log(x+1))=1+2/2!*x^2-3/3!*x^3+28/4!*x^4-110/5!*x^5...
%t A012697 With[{nn=20},CoefficientList[Series[Exp[ArcTanh[x]Log[x+1]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Dec 08 2019 *)
%K A012697 sign
%O A012697 0,3
%A A012697 Patrick Demichel (patrick.demichel(AT)hp.com)
%E A012697 Definition clarified by _Harvey P. Dale_, Dec 08 2019