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 A364616 #12 Apr 05 2025 09:19:09 %S A364616 1,2,108,3540,115958,3927233,128441094,4263997124,141186107223, %T A364616 4671227129777,154679198549385,5119908497703914,169488865440883593, %U A364616 5610718094136694973,185732776135043052107,6148417237267189975927,203533740825252409802705,6737670699036802296758849 %N A364616 Number of tilings of a 6 X n rectangle using dominoes and trominoes (of any shape). %H A364616 Alois P. Heinz, <a href="/A364616/b364616.txt">Table of n, a(n) for n = 0..500</a> %H A364616 Wikipedia, <a href="https://en.wikipedia.org/wiki/Domino_(mathematics)">Domino (mathematics)</a> %H A364616 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tromino">Tromino</a> %e A364616 a(1) = 2: %e A364616 ._. ._. %e A364616 | | | | %e A364616 |_| | | %e A364616 | | |_| %e A364616 |_| | | %e A364616 | | | | %e A364616 |_| |_| . %Y A364616 Column k=6 of A364457. %K A364616 nonn %O A364616 0,2 %A A364616 _Alois P. Heinz_, Jul 29 2023 %E A364616 Terms n>=4 had to be corrected as was pointed out by _Martin Fuller_ and _David Radcliffe_ - _Alois P. Heinz_, Apr 05 2025