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 A247768 #11 May 02 2022 10:00:50 %S A247768 1,1,3,36,177,1300,8866,54849,372943,2466986,16335736,108823634, %T A247768 719573862,4776148981,31691581679,210171600724,1394511598079, %U A247768 9249464911748,61356588838016,407022840274446,2699962045755658,17910503042677994,118809774179725990 %N A247768 Number of tilings of a 5 X n rectangle using n pentominoes of any but the L shape. %H A247768 Alois P. Heinz, <a href="/A247768/b247768.txt">Table of n, a(n) for n = 0..500</a> %H A247768 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a> %F A247768 a(n) ~ c * d^n, where d = 6.63354739064799173452910396285896274912377276863088340465087347768..., c = 0.09918446577271493875329249874198830860996222825871620867051185835... . - _Vaclav Kotesovec_, Mar 05 2016 %Y A247768 Column k=0 of A247704. %Y A247768 Cf. A174249, A233427. %K A247768 nonn %O A247768 0,3 %A A247768 _Alois P. Heinz_, Sep 23 2014