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 A220124 #11 Sep 05 2021 19:17:51 %S A220124 1,1,2,4,7,13,46,88,209,473,1002,2120,5197,11085,25384,57234,126959, %T A220124 279883,640387,1412460,3182794,7138463,15963680,35593612,80143244, %U A220124 178644947,400681480,897313564,2008904252,4492651815,10074017008,22526314856,50459193392 %N A220124 Number of tilings of a 6 X n rectangle using integer-sided rectangular tiles of area 6. %H A220124 Alois P. Heinz, <a href="/A220124/b220124.txt">Table of n, a(n) for n = 0..1000</a> %e A220124 a(4) = 7, because there are 7 tilings of a 6 X 4 rectangle using integer-sided rectangular tiles of area 6: %e A220124 ._._._._. ._._._._. ._._._._. ._._._._. ._._._._. ._._._._. ._._._._. %e A220124 | | | | | | | | | | | | | | | | | | | | | | | | | | %e A220124 | | | | | | | | | | | | | | | | | | | | | | | | | | %e A220124 | | | | | |___| | | | |___| | | | |___| |___|___| |_____| | | |_____| %e A220124 | | | | | | | | | | | | | | | | | | | | | | | | | | %e A220124 | | | | | | | | | | | | | | | | | | | | | | | | | | %e A220124 |_|_|_|_| |___|_|_| |_|___|_| |_|_|___| |___|___| |_____|_| |_|_____| %Y A220124 Column k=6 of A220122. %K A220124 nonn %O A220124 0,3 %A A220124 _Alois P. Heinz_, Dec 05 2012