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 A247777 #8 May 02 2022 10:03:35 %S A247777 1,1,5,52,451,3498,23502,173611,1323447,9920654,73573634,545170514, %T A247777 4060213800,30266880736,225316532881,1676398961171,12475867876511, %U A247777 92870049802057,691310371544378,5145544200921776,38298595223058076,285066094324142481,2121840794371117780 %N A247777 Number of tilings of a 5 X n rectangle using n pentominoes of any but the Z shape. %H A247777 Alois P. Heinz, <a href="/A247777/b247777.txt">Table of n, a(n) for n = 0..500</a> %H A247777 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %Y A247777 Column k=0 of A247713. %Y A247777 Cf. A174249, A233427. %K A247777 nonn %O A247777 0,3 %A A247777 _Alois P. Heinz_, Sep 23 2014