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 A254453 #6 Jul 23 2025 14:41:31 %S A254453 76832,1279568,19716320,275772848,3694478768,48236381800,623402653056, %T A254453 8027022727640,103264924928344,1328657798616824,17098462225957872, %U A254453 220073014797498536,2832785034766355768,36465171455788005608 %N A254453 Number of (n+2)X(4+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically. %C A254453 Column 4 of A254457 %H A254453 R. H. Hardin, <a href="/A254453/b254453.txt">Table of n, a(n) for n = 1..210</a> %e A254453 Some solutions for n=1 %e A254453 ..0..1..0..0..0..0....0..1..0..0..1..0....1..1..1..1..0..0....1..0..1..0..1..0 %e A254453 ..0..0..0..0..1..0....1..0..1..0..0..0....0..1..1..0..0..1....0..1..1..1..1..0 %e A254453 ..1..1..1..0..1..1....1..1..0..1..0..0....1..1..1..1..0..0....0..1..0..0..0..0 %K A254453 nonn %O A254453 1,1 %A A254453 _R. H. Hardin_, Jan 30 2015