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 A250912 #6 May 25 2024 23:38:12 %S A250912 21553018,72721157625,245114118899485,826125782084148708, %T A250912 2784331051704024117237,9384142308556191112974969, %U A250912 31627738616791159166366474706,106596185653227343496197522538691 %N A250912 Number of (n+1) X (7+1) 0..2 arrays with no 2 X 2 subblock having its maximum diagonal element less than its minimum antidiagonal element. %C A250912 Column 7 of A250913. %H A250912 R. H. Hardin, <a href="/A250912/b250912.txt">Table of n, a(n) for n = 1..210</a> %e A250912 Some solutions for n=1 %e A250912 ..0..0..0..0..0..0..1..1....0..0..0..0..1..0..0..2....0..0..0..0..0..0..2..2 %e A250912 ..0..1..1..2..2..0..2..1....1..0..0..2..2..0..0..0....0..0..1..2..1..0..2..2 %Y A250912 Cf. A250913. %K A250912 nonn %O A250912 1,1 %A A250912 _R. H. Hardin_, Nov 28 2014