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 A270068 #8 Feb 06 2017 12:33:28 %S A270068 1,13,4287,940916,204383373,44538604036,9756894398324, %T A270068 2133436326533143,466326405037190729,101965922336345576219, %U A270068 22294594753523459270694,4874505512330163994345181,1065778806957316983452583926,233025803338941141247495062594 %N A270068 Number of tilings of an 8 X n rectangle using monominoes and trominoes of any shape. %H A270068 Alois P. Heinz, <a href="/A270068/b270068.txt">Table of n, a(n) for n = 0..430</a> %H A270068 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tromino">Tromino</a> %Y A270068 Column k=8 of A270061. %K A270068 nonn %O A270068 0,2 %A A270068 _Alois P. Heinz_, Mar 09 2016