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 A362247 #10 Apr 13 2023 08:29:47
%S A362247 1,1,1,7,37,201,1531,12433,112729,1158769,12920311,157007841,
%T A362247 2063354437,29052921769,436908104179,6981843029281,118083965782321,
%U A362247 2106973566128865,39538081855597807,778216030845226561,16027517577057849181,344635879922587951321
%N A362247 Expansion of e.g.f. exp(x * exp(x * (exp(x) - 1))).
%F A362247 a(n) = n! * Sum_{i=0..n} ( Sum_{j=0..n-i} i^j * Stirling2(n-i-j,j)/(n-i-j)! )/i!.
%o A362247 (PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(x*exp(x*(exp(x)-1)))))
%Y A362247 Cf. A362244, A362245, A362246.
%Y A362247 Cf. A000258, A202152.
%K A362247 nonn
%O A362247 0,4
%A A362247 _Seiichi Manyama_, Apr 12 2023