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 A239271 #6 Mar 19 2014 14:08:24 %S A239271 1,341,1968400,18633949879,185175369431551,1851260737169108297, %T A239271 18523901518471987018869,185376808904045560177646408, %U A239271 1855186116430353424133583769247,18566115077411836147307357343137943,185803902034786238482393324889706764945 %N A239271 Number of domicule tilings of a 9 X 2n grid. %C A239271 A domicule is either a domino or it is formed by the union of two neighboring unit squares connected via their corners. In a tiling the connections of two domicules are allowed to cross each other. %H A239271 Alois P. Heinz, <a href="/A239271/b239271.txt">Table of n, a(n) for n = 0..200</a> %Y A239271 Even bisection of column k=9 of A239264. %K A239271 nonn %O A239271 0,2 %A A239271 _Alois P. Heinz_, Mar 13 2014