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 A181396 #5 Jan 06 2020 20:33:17 %S A181396 4,104,1206,13132,148432,1692480,18893254,205592002,2192518424, %T A181396 23040437586,239444000256,2466260663869,25213885065100, %U A181396 256147799888040,2588077377850470,26026306944344453,260646721044701192,2600801818956016811,25867424061321255322,256529866716776061643 %N A181396 Summed lengths of nonintersecting rook paths on a 5 X n board. %C A181396 Paths are self-avoiding from one corner to the diagonally opposite corner. %H A181396 Andrew Howroyd, <a href="/A181396/b181396.txt">Table of n, a(n) for n = 1..200</a> %Y A181396 Row 5 of A181399. %Y A181396 Enumeration of these paths is A007787, related sequences A181394, A181395, A181397, A181398. %K A181396 nonn %O A181396 1,1 %A A181396 _David Scambler_, Oct 17 2010 %E A181396 Terms a(8) and beyond from _Andrew Howroyd_, Jan 06 2020