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 A246764 #15 Feb 07 2017 10:23:07 %S A246764 1,1,3,7,17,78,247,916,3301,11272,41854,150485,538585,1954912,6978464, %T A246764 25170446,90851829,326048198,1176355862,4230352602,15222263126, %U A246764 54855015353,197302183497,710556528403,2557837610375,9205575728179,33148388282116,119307072980025 %N A246764 Number of tilings of a 5 X n rectangle using n pentominoes of shapes P, I, N, T. %H A246764 Alois P. Heinz, <a href="/A246764/b246764.txt">Table of n, a(n) for n = 0..1000</a> %H A246764 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %Y A246764 Cf. A174249, A233427, A247103, A247196. %K A246764 nonn %O A246764 0,3 %A A246764 _Alois P. Heinz_, Nov 28 2014