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 A181397 #5 Jan 06 2020 20:33:22 %S A181397 5,256,4882,88608,1692480,32871240,629907345,11836974284,218772951624, %T A181397 3990894156672,72039322124013,1289057677580204,22896767645452466, %U A181397 404155803725865164,7095412544059877973,123985136981584276480,2157631059961863479079,37411816576772657794784 %N A181397 Summed lengths of nonintersecting rook paths on a 6 X n board. %C A181397 Paths are self-avoiding from one corner to the diagonally opposite corner. %H A181397 Andrew Howroyd, <a href="/A181397/b181397.txt">Table of n, a(n) for n = 1..200</a> %Y A181397 Row 6 of A181399. %Y A181397 Related sequences A181394, A181395, A181396, A181398. %K A181397 nonn %O A181397 1,1 %A A181397 _David Scambler_, Oct 17 2010 %E A181397 Terms a(7) and beyond from _Andrew Howroyd_, Jan 06 2020