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 A292953 #13 Sep 30 2017 04:40:05
%S A292953 1,0,-1,-3,-3,20,150,504,-343,-18180,-140220,-500500,2032899,50210082,
%T A292953 441768236,1740141480,-13025325615,-330558552376,-3452606080848,
%U A292953 -16648495695792,136964192085395,4315989335784630,55121200672923924,352945156766431592
%N A292953 E.g.f.: exp(-1/2! * x^2 * exp(x)).
%H A292953 Seiichi Manyama, <a href="/A292953/b292953.txt">Table of n, a(n) for n = 0..541</a>
%o A292953 (PARI) x='x+O('x^66); Vec(serlaplace(exp(-1/2!*x^2*exp(x))))
%Y A292953 Column k=2 of A293015.
%Y A292953 Cf. A292952 (k=1), this sequence (k=2), A292954 (k=3), A292955 (k=4).
%K A292953 sign
%O A292953 0,4
%A A292953 _Seiichi Manyama_, Sep 27 2017