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 A247766 #13 May 02 2022 09:59:22 %S A247766 1,1,5,52,437,3342,21734,155685,1153475,8422634,60853524,438333924, %T A247766 3175356262,23029289042,166811590187,1207552045117,8742472744191, %U A247766 63314217459429,458530998840648,3320452657540486,24044504957977794,174117682083426003,1260888371373690768 %N A247766 Number of tilings of a 5 X n rectangle using n pentominoes of any but the F shape. %H A247766 Alois P. Heinz, <a href="/A247766/b247766.txt">Table of n, a(n) for n = 0..500</a> %H A247766 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %F A247766 a(n) ~ c * d^n, where d = 7.241529119192925682256364476268481441420871104664776204493646758..., c = 0.152901253189973886265833028181003326101047083395939246873454890... . - _Vaclav Kotesovec_, Mar 05 2016 %Y A247766 Column k=0 of A247702. %Y A247766 Cf. A174249, A233427. %K A247766 nonn %O A247766 0,3 %A A247766 _Alois P. Heinz_, Sep 23 2014