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 A232758 #13 Feb 07 2017 17:25:14 %S A232758 1,454,800290,1601437357,3241461223149,6567785027546670, %T A232758 13308739956169022829,26968602201880345700924, %U A232758 54648749693738816337819872,110739369582262512718466467943,224400523235840773380469046439552,454721704049686545819883721501971896 %N A232758 Number of tilings of a 5 X 4n rectangle with 5n tetrominoes of any shape. %H A232758 Alois P. Heinz, <a href="/A232758/b232758.txt">Table of n, a(n) for n = 0..250</a> %H A232758 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 A232758 R. S. Harris, <a href="http://www.bumblebeagle.org/polyominoes/tilingcounting">Counting Polyomino Tilings</a> %H A232758 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetris">Tetris</a> %H A232758 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tetromino">Tetromino</a> %Y A232758 Quadrisection of column k=5 of A230031. %K A232758 nonn %O A232758 0,2 %A A232758 _Alois P. Heinz_, Nov 29 2013