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 A254166 #6 Jul 23 2025 14:29:17 %S A254166 1511152,41678024,1263003480,34167243308,910592737776,24789263869340, %T A254166 676750215074144,18480715303252452,505390499990828432, %U A254166 13826872992791323340,378264415847818916192,10348392913354433560800 %N A254166 Number of (n+2)X(6+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. %C A254166 Column 6 of A254168 %H A254166 R. H. Hardin, <a href="/A254166/b254166.txt">Table of n, a(n) for n = 1..210</a> %e A254166 Some solutions for n=1 %e A254166 ..0..0..0..1..0..0..1..1....0..0..0..1..0..1..0..1....0..0..0..0..1..1..1..0 %e A254166 ..1..1..1..0..1..1..0..1....0..0..0..0..1..1..0..0....0..0..0..1..0..1..1..0 %e A254166 ..1..0..0..1..0..0..0..0....1..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0 %K A254166 nonn %O A254166 1,1 %A A254166 _R. H. Hardin_, Jan 26 2015