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 A362274 #13 Apr 15 2023 06:27:58
%S A362274 1,1,4,27,232,2465,31416,467173,7940080,151824177,3225664720,
%T A362274 75386002901,1921987809336,53085088574713,1578989028324904,
%U A362274 50320957240554645,1710595789688360416,61783832256587799137,2362794061464082513440,95380148553556615501717
%N A362274 Expansion of e.g.f. 1/(1-x*exp(x*exp(x))).
%H A362274 Winston de Greef, <a href="/A362274/b362274.txt">Table of n, a(n) for n = 0..398</a>
%F A362274 a(n) = n! * Sum_{i=0..n} Sum_{j=0..n-i} i^j * j^(n-i-j) / (j! * (n-i-j)!).
%o A362274 (PARI) my(N=20, x='x+O('x^N)); Vec(serlaplace(1/(1-x*exp(x*exp(x)))))
%Y A362274 Cf. A000949, A362273, A362275.
%Y A362274 Cf. A362245.
%K A362274 nonn
%O A362274 0,3
%A A362274 _Seiichi Manyama_, Apr 13 2023