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 A295240 #7 Aug 09 2021 04:19:18
%S A295240 1,1,8,129,3748,172385,11541246,1060864189,128254619480,
%T A295240 19735654508577,3766841223919930,873355411013249021,
%U A295240 241783431463815426516,78781867440446089479937,29844928122224237593463270,13007143530120743289176560125,6462200434400107274026753685296
%N A295240 Expansion of e.g.f. 1/(1 - x*exp(x)/(1 - 2*x*exp(x)/(1 - 3*x*exp(x)/(1 - 4*x*exp(x)/(1 - ...))))), a continued fraction.
%F A295240 a(n) ~ sqrt(Pi) * 2^(n+1) * n^(2*n + 1/2) / exp(2*n - 1/2). - _Vaclav Kotesovec_, Aug 09 2021
%t A295240 nmax = 16; CoefficientList[Series[1/(1 + ContinuedFractionK[-k x Exp[x], 1, {k, 1, nmax}]), {x, 0, nmax}], x] Range[0, nmax]!
%Y A295240 Cf. A295238, A295241, A295242.
%K A295240 nonn
%O A295240 0,3
%A A295240 _Ilya Gutkovskiy_, Nov 18 2017