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 A254173 #6 Jul 23 2025 14:30:03 %S A254173 1511152,36538548,1054310240,31143715804,886761490936,24789263869340, %T A254173 684072377169008,18738106424812380,512823923719769272, %U A254173 14030281670008005564,383831267774223029112,10500422875690342522680 %N A254173 Number of (6+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 A254173 Row 6 of A254168 %H A254173 R. H. Hardin, <a href="/A254173/b254173.txt">Table of n, a(n) for n = 1..210</a> %e A254173 Some solutions for n=1 %e A254173 ..0..0..0....0..0..0....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0 %e A254173 ..0..0..1....0..0..0....1..0..1....1..0..1....1..0..0....0..0..1....0..1..0 %e A254173 ..1..1..0....0..1..0....0..1..0....1..1..0....0..0..0....1..1..0....1..0..0 %e A254173 ..0..1..1....1..0..1....0..0..0....1..1..0....1..1..0....1..1..1....0..1..0 %e A254173 ..1..1..1....1..1..0....0..0..0....1..0..0....0..0..0....1..1..0....1..1..0 %e A254173 ..0..0..0....1..1..0....1..0..0....1..1..1....0..1..0....0..0..0....0..0..1 %e A254173 ..0..0..0....1..0..0....0..0..0....0..0..1....0..0..0....0..1..1....1..0..0 %e A254173 ..0..0..1....0..0..0....0..0..0....0..0..0....1..1..1....0..1..1....0..1..1 %K A254173 nonn %O A254173 1,1 %A A254173 _R. H. Hardin_, Jan 26 2015