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 A334564 #19 May 03 2021 02:13:48
%S A334564 1,-1,-1,-1,1,139,151,-1429,-19039,-170281,517231,12144439,108063649,
%T A334564 294730019,-12338255929,-161010756061,-834576525119,10909293532591,
%U A334564 350211422028511,3176429907556079,-8268487440910399,-816508001025525061,-14017265801126968841,-55997107943920795301
%N A334564 E.g.f.: exp(-(x + x^2 + x^3 + x^4)).
%H A334564 Seiichi Manyama, <a href="/A334564/b334564.txt">Table of n, a(n) for n = 0..500</a>
%F A334564 a(0) = 1 and a(n) = - (n-1)! * Sum_{k=1..min(4,n)} k*a(n-k)/(n-k)!.
%t A334564 m = 25; Range[0, m]! * CoefficientList[Series[Exp[-(x + x^2 + x^3 + x^4)], {x, 0, m}], x] (* _Amiram Eldar_, May 03 2021 *)
%o A334564 (PARI) N=40; x='x+O('x^N); Vec(serlaplace(exp(-x-x^2-x^3-x^4)))
%Y A334564 Column 4 of A334561.
%Y A334564 Cf. A193930, A334570.
%K A334564 sign
%O A334564 0,6
%A A334564 _Seiichi Manyama_, May 06 2020