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 A254167 #6 Jul 23 2025 14:29:24 %S A254167 6440848,251430924,11377995944,443654425392,17154177879840, %T A254167 684072377169008,27196332026497280,1080962116495110480, %U A254167 43035049375564396528,1714089719759716209888,68251517989933263549920 %N A254167 Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. %C A254167 Column 7 of A254168 %H A254167 R. H. Hardin, <a href="/A254167/b254167.txt">Table of n, a(n) for n = 1..142</a> %e A254167 Some solutions for n=1 %e A254167 ..0..0..0..0..1..0..1..1..0....0..0..0..0..1..0..1..1..0 %e A254167 ..1..0..0..1..0..1..1..0..0....0..1..1..0..0..1..0..1..1 %e A254167 ..1..1..0..0..0..0..0..1..1....1..1..1..1..1..0..0..0..1 %K A254167 nonn %O A254167 1,1 %A A254167 _R. H. Hardin_, Jan 26 2015