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 A254174 #6 Jul 23 2025 14:30:09 %S A254174 6440848,217539476,9378850720,399587109728,16524431408400, %T A254174 676750215074144,27196332026497280,1084445796373438616, %U A254174 43207926374198188784,1720925651447157696832,68523513350608477133408 %N A254174 Number of (7+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 A254174 Row 7 of A254168 %H A254174 R. H. Hardin, <a href="/A254174/b254174.txt">Table of n, a(n) for n = 1..88</a> %e A254174 Some solutions for n=1 %e A254174 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 %e A254174 ..0..0..1....0..0..1....0..0..1....0..0..1....0..0..0....1..0..0....1..0..1 %e A254174 ..1..1..0....0..0..0....0..1..0....0..1..0....0..1..0....0..1..0....0..0..0 %e A254174 ..1..0..0....1..0..1....0..0..1....0..0..0....0..1..0....1..0..1....1..0..1 %e A254174 ..1..0..0....1..1..0....1..1..0....1..0..0....0..1..0....1..0..0....1..0..0 %e A254174 ..1..0..0....1..1..0....1..1..0....0..1..0....0..1..1....0..1..0....1..1..0 %e A254174 ..1..0..0....1..1..0....1..0..1....0..0..0....0..0..0....0..1..0....1..1..0 %e A254174 ..1..0..1....1..0..0....1..0..0....0..1..1....0..1..1....0..0..0....0..1..1 %e A254174 ..0..0..1....0..0..0....0..0..0....0..0..1....0..0..1....1..1..1....0..0..0 %K A254174 nonn %O A254174 1,1 %A A254174 _R. H. Hardin_, Jan 26 2015