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 A294256 #10 Oct 27 2017 04:07:27
%S A294256 1,-1,-1,5,25,-41,-1769,7181,74705,-236305,-7562609,-4169771,
%T A294256 1339186729,-2144219065,-174083994265,-370106105251,35885107199521,
%U A294256 252732128552671,-10892824509622625,-56149731134394715,2589936417283432121,31565855231279227319
%N A294256 E.g.f.: exp((1-x)*(1-x^2)*(1-x^3) - 1).
%H A294256 Seiichi Manyama, <a href="/A294256/b294256.txt">Table of n, a(n) for n = 0..491</a>
%o A294256 (PARI) N=66; x='x+O('x^N); Vec(serlaplace(exp((1-x)*(1-x^2)*(1-x^3)-1)))
%Y A294256 Column k=3 of A294254.
%K A294256 sign
%O A294256 0,4
%A A294256 _Seiichi Manyama_, Oct 26 2017