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 A247772 #8 May 02 2022 10:02:16 %S A247772 1,1,5,39,369,2908,19185,137200,1022915,7606043,55699672,405617356, %T A247772 2969215193,21791407596,159806458014,1170659384512,8574740528977, %U A247772 62830753812692,460445907547463,3374031670320652,24722398637797408,181148733466258107,1327366881461315358 %N A247772 Number of tilings of a 5 X n rectangle using n pentominoes of any but the U shape. %H A247772 Alois P. Heinz, <a href="/A247772/b247772.txt">Table of n, a(n) for n = 0..500</a> %H A247772 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %Y A247772 Column k=0 of A247708. %Y A247772 Cf. A174249, A233427. %K A247772 nonn %O A247772 0,3 %A A247772 _Alois P. Heinz_, Sep 23 2014