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 A254172 #6 Jul 23 2025 14:29:57 %S A254172 348032,6159516,119471400,2437141776,47722312832,910592737776, %T A254172 17154177879840,320795556150368,5990669265231248,111829906812254944, %U A254172 2087633151218299392,38972776946929655072,727593935236788680400 %N A254172 Number of (5+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. %C A254172 Row 5 of A254168 %H A254172 R. H. Hardin, <a href="/A254172/b254172.txt">Table of n, a(n) for n = 1..210</a> %e A254172 Some solutions for n=1 %e A254172 ..0..0..1....0..0..0....0..0..1....1..0..0....0..0..1....0..0..1....0..0..1 %e A254172 ..1..0..1....0..0..1....0..0..1....0..0..0....0..0..1....1..0..1....1..0..1 %e A254172 ..1..1..0....0..0..0....0..1..0....1..1..1....1..1..0....1..1..0....1..1..1 %e A254172 ..1..1..1....1..0..1....0..1..1....0..0..0....1..1..0....1..1..0....0..1..0 %e A254172 ..1..0..1....1..1..0....1..1..0....0..1..0....0..0..0....1..1..0....1..1..1 %e A254172 ..1..1..0....1..1..1....1..0..0....0..1..0....0..0..1....1..0..1....1..1..0 %e A254172 ..0..1..0....1..0..1....0..0..0....0..0..1....0..0..1....1..1..0....1..1..0 %K A254172 nonn %O A254172 1,1 %A A254172 _R. H. Hardin_, Jan 26 2015