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 A286789 #12 May 17 2017 22:53:24 %S A286789 1,80,3550,125195,4009832,124266346,3854188670,121943460540, %T A286789 3979525634005,134806148044750,4756728585598416,175132764223880035, %U A286789 6731931366383154760,270129431174068396380,11308903054417009540644,493544598057755406560688,22431785171561428611320865 %N A286789 Column 4 of A286781. %H A286789 Gheorghe Coserea, <a href="/A286789/b286789.txt">Table of n, a(n) for n = 4..213</a> %Y A286789 Cf. A286781, A286786, A286787. %K A286789 nonn %O A286789 4,2 %A A286789 _Gheorghe Coserea_, May 16 2017