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 A294255 #10 Oct 27 2017 04:06:41
%S A294255 1,-1,-1,11,-23,-101,991,-1849,-24751,220823,-174689,-10924541,
%T A294255 87639289,105372851,-7496679553,52397291519,238887991201,
%U A294255 -7313210597969,41947208776639,440627548672763,-9537975555701239,39732691614159179,916052993052974239
%N A294255 E.g.f.: exp((1-x)*(1-x^2) - 1).
%H A294255 Seiichi Manyama, <a href="/A294255/b294255.txt">Table of n, a(n) for n = 0..578</a>
%o A294255 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp((1-x)*(1-x^2)-1)))
%Y A294255 Column k=2 of A294254.
%K A294255 sign
%O A294255 0,4
%A A294255 _Seiichi Manyama_, Oct 26 2017