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 A247773 #8 May 02 2022 10:02:31 %S A247773 1,1,5,38,329,2614,17400,122843,901647,6662758,48492622,351153718, %T A247773 2549170764,18557754476,135119522565,982657665633,7145326366447, %U A247773 51965861513279,377997475235382,2749505470031020,19998020429893220,145451451407796951,1057925773226867974 %N A247773 Number of tilings of a 5 X n rectangle using n pentominoes of any but the V shape. %H A247773 Alois P. Heinz, <a href="/A247773/b247773.txt">Table of n, a(n) for n = 0..500</a> %H A247773 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %Y A247773 Column k=0 of A247709. %Y A247773 Cf. A174249, A233427. %K A247773 nonn %O A247773 0,3 %A A247773 _Alois P. Heinz_, Sep 23 2014