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 A232759 #11 Feb 07 2017 17:27:05 %S A232759 1,9157,657253434,58480141962875,5316709999497259059, %T A232759 484393789403397886429249,44141190389848159904786733934, %U A232759 4022519784390988451174562198889336,366566828291367228800261059891047626895,33404748935117787113145811582089363383972226 %N A232759 Number of tilings of a 7 X 4n rectangle with 7n tetrominoes of any shape. %H A232759 Alois P. Heinz, <a href="/A232759/b232759.txt">Table of n, a(n) for n = 0..70</a> %H A232759 S. Butler, J. Ekstrand, S. Osborne, <a href="/A230031/a230031.pdf">TETRIS Tiling</a>, AMS Spring Central Sectional, Iowa State University, April 27-28 2013 %H A232759 R. S. Harris, <a href="http://www.bumblebeagle.org/polyominoes/tilingcounting">Counting Polyomino Tilings</a> %H A232759 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetris">Tetris</a> %H A232759 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetromino">Tetromino</a> %Y A232759 Quadrisection of column k=7 of A230031. %K A232759 nonn %O A232759 0,2 %A A232759 _Alois P. Heinz_, Nov 29 2013