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 A247770 #8 May 02 2022 10:01:42 %S A247770 1,1,3,16,135,944,4814,26435,158761,978044,5847896,34112584,200686378, %T A247770 1192024482,7093151801,42038865123,248625856115,1472077262971, %U A247770 8724918986240,51715149361624,306384777098954,1814848220902299,10751681585808618,63702848673263049 %N A247770 Number of tilings of a 5 X n rectangle using n pentominoes of any but the P shape. %H A247770 Alois P. Heinz, <a href="/A247770/b247770.txt">Table of n, a(n) for n = 0..500</a> %H A247770 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %Y A247770 Column k=0 of A247706. %Y A247770 Cf. A174249, A233427. %K A247770 nonn %O A247770 0,3 %A A247770 _Alois P. Heinz_, Sep 23 2014