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 A322499 #5 Dec 12 2018 10:40:31 %S A322499 1,1,13,107,838,6523,51420,396500,3086898,24009733,186735416, %T A322499 1452320952,11295996925,87852065113,683271518863,5314139902766, %U A322499 41330688551925,321449136734050,2500069029481412,19444268928224485,151227677898412290,1176172285095334802 %N A322499 Number of tilings of a 6 X n rectangle using V (2m+1)-ominoes (m >= 0) in standard orientation. %C A322499 The shapes of the tiles are: %C A322499 ._. %C A322499 ._. | | %C A322499 ._. | | | | %C A322499 ._. | |_. | |_._. | |_._._. %C A322499 |_| |___| |_____| |_______| ... . %H A322499 Alois P. Heinz, <a href="/A322499/b322499.txt">Table of n, a(n) for n = 0..1000</a> %H A322499 Wikipedia, <a href="https://en.wikipedia.org/wiki/Polyomino">Polyomino</a> %Y A322499 Column k=6 of A322494. %K A322499 nonn,easy %O A322499 0,3 %A A322499 _Alois P. Heinz_, Dec 12 2018