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 A362279 #14 Apr 16 2023 09:47:48
%S A362279 1,1,-4,-14,46,326,-824,-10604,18236,442396,-378224,-22498024,
%T A362279 -1695704,1348185736,1458406496,-92914595024,-202295082224,
%U A362279 7230872519696,24425954508736,-626352572263904,-2946818250593824,59688438975796576,369104355288148096
%N A362279 Expansion of e.g.f. exp(x - 5*x^2/2).
%H A362279 Seiichi Manyama, <a href="/A362279/b362279.txt">Table of n, a(n) for n = 0..649</a>
%F A362279 a(n) = a(n-1) - 5*(n-1)*a(n-2) for n > 1.
%F A362279 a(n) = n! * Sum_{k=0..floor(n/2)} (-5/2)^k / (k! * (n-2*k)!).
%o A362279 (PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(x-5*x^2/2)))
%Y A362279 Column k=5 of A362277.
%Y A362279 Cf. A115331.
%K A362279 sign,easy
%O A362279 0,3
%A A362279 _Seiichi Manyama_, Apr 13 2023