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 A254454 #6 Jul 23 2025 14:41:38 %S A254454 348032,8004340,180449544,3694478768,71814202464,1361600709160, %T A254454 25559706957728,477527208118064,8914309947159936,166394248745025720, %U A254454 3106150000937339496,57987156539044753960,1082578576823679598584 %N A254454 Number of (n+2)X(5+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically. %C A254454 Column 5 of A254457 %H A254454 R. H. Hardin, <a href="/A254454/b254454.txt">Table of n, a(n) for n = 1..210</a> %e A254454 Some solutions for n=1 %e A254454 ..0..0..1..0..0..0..0....0..0..1..1..0..1..0....0..0..1..1..1..0..0 %e A254454 ..1..0..0..1..0..0..0....1..0..1..1..0..0..1....1..1..1..1..1..0..0 %e A254454 ..1..0..1..0..0..1..1....0..0..0..0..0..0..1....0..1..0..0..0..1..1 %K A254454 nonn %O A254454 1,1 %A A254454 _R. H. Hardin_, Jan 30 2015