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 A202886 #8 Jul 19 2023 09:39:59 %S A202886 51,13345,2223723,348151747,56006562037,9024909392725, %T A202886 1452080571954205,233641209300452607,37595413242729744773, %U A202886 6049464276674659581373,973416350404566342317495,156632059367518718442398187 %N A202886 Number of nX5 0..2 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor. %H A202886 R. H. Hardin, <a href="/A202886/b202886.txt">Table of n, a(n) for n = 1..210</a> %e A202886 Some solutions for n=2 %e A202886 ..2..2..1..2..2....1..0..0..2..2....1..2..2..1..0....1..1..1..2..0 %e A202886 ..1..1..1..0..2....2..2..0..0..1....0..1..2..0..0....0..2..2..2..1 %Y A202886 Column 5 of A202889. %K A202886 nonn %O A202886 1,1 %A A202886 _R. H. Hardin_, Dec 25 2011