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 A088181 #8 Jun 08 2021 06:41:57
%S A088181 1,2,8,49,400,4081,49964,713665,11649936,213946513,4365604372,
%T A088181 97988751433,2399366732888,63647177397961,1818219651069852,
%U A088181 55651486523443537,1816920458689600288,63026617425620098465
%N A088181 E.g.f.: 1/(1-sinh(x)-x).
%F A088181 a(n) ~ n! / ((cosh(r)+1) * r^(n+1)), where r = 0.49007306848054777421543028443773199472978824305677445770838... is the root of the equation 2*(r-1)*exp(r)+exp(2*r) = 1. - _Vaclav Kotesovec_, Jun 08 2021
%t A088181 With[{nn=20},CoefficientList[Series[1/(1-Sinh[x]-x),{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Apr 10 2014 *)
%Y A088181 Cf. A006154.
%K A088181 nonn
%O A088181 0,2
%A A088181 _Karol A. Penson_, Sep 22 2003
%E A088181 First term prepended and offset changed by _Harvey P. Dale_, Apr 10 2014