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 A012598 #12 May 06 2025 10:07:13
%S A012598 1,2,12,208,6608,438912,38672832,5956592640,1035058952448,
%T A012598 288405058560000,83042522104507392,36519438671549890560,
%U A012598 15719007594987094364160,10017433660808198506414080
%N A012598 Expansion of e.g.f. exp(arcsinh(x)*arcsin(x)).
%H A012598 Harvey P. Dale, <a href="/A012598/b012598.txt">Table of n, a(n) for n = 0..200</a>
%e A012598 1+2/2!*x^2+12/4!*x^4+208/6!*x^6+6608/8!*x^8...
%t A012598 With[{nn=30},Take[CoefficientList[Series[Exp[ArcSinh[x]ArcSin[x]],{x,0,nn}], x]Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, May 19 2012 *)
%K A012598 nonn
%O A012598 0,2
%A A012598 Patrick Demichel (patrick.demichel(AT)hp.com)
%E A012598 Definition clarified by _Harvey P. Dale_, May 19 2012