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 A362273 #17 Apr 15 2023 06:27:52
%S A362273 1,1,0,3,8,-15,264,-35,-1968,87633,-499600,2375901,48964200,
%T A362273 -830424023,9884072184,-11730111315,-1407884197216,36601422429345,
%U A362273 -416600839315872,191233500832189,136472124267672120,-3513232740127917639,46653752740647748520
%N A362273 Expansion of e.g.f. 1/(1 - x * exp(-x * exp(-x))).
%H A362273 Winston de Greef, <a href="/A362273/b362273.txt">Table of n, a(n) for n = 0..455</a>
%F A362273 a(n) = n! * Sum_{i=0..n} (-1)^(n-i) * Sum_{j=0..n-i} i^j * j^(n-i-j) / (j! * (n-i-j)!).
%o A362273 (PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(1/(1-x*exp(-x*exp(-x)))))
%Y A362273 Cf. A000949, A362274, A362275.
%Y A362273 Cf. A362244.
%K A362273 sign
%O A362273 0,4
%A A362273 _Seiichi Manyama_, Apr 13 2023