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 A220060 #4 Dec 03 2012 17:19:32 %S A220060 1,1,13377,1620843,914646205,272086395449,103598912114381, %T A220060 35743258143250665,12820466607209726137,4528155459015015278497, %U A220060 1609120545126107661426575,570433530146121798730683231,202412926394304755588236748481,71796961505258542492662333092533 %N A220060 Number of tilings of a 10 X n rectangle using right trominoes and 1 X 1 tiles. %H A220060 Alois P. Heinz, <a href="/A220060/b220060.txt">Table of n, a(n) for n = 0..150</a> %Y A220060 Column k=10 of A220054. %K A220060 nonn %O A220060 0,3 %A A220060 _Alois P. Heinz_, Dec 03 2012