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 A254452 #8 Jul 23 2025 14:41:24 %S A254452 16240,196684,2085712,19716320,180449544,1621936236,14531913928, %T A254452 129887483092,1161335601368,10386990863516,92949534517728, %U A254452 831971480294236,7447848925974544,66677163384618652,596944337713575200 %N A254452 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal median nondecreasing horizontally and vertically. %C A254452 Column 3 of A254457 %H A254452 R. H. Hardin, <a href="/A254452/b254452.txt">Table of n, a(n) for n = 1..210</a> %H A254452 R. H. Hardin, <a href="/A254452/a254452.txt">Empirical recurrence of order 73</a> %F A254452 Empirical recurrence of order 73 (see link above) %e A254452 Some solutions for n=2 %e A254452 ..0..1..1..1..0....0..0..1..0..1....0..1..0..1..0....1..1..1..1..0 %e A254452 ..1..1..0..1..0....1..1..1..1..1....0..0..1..1..0....0..0..1..1..1 %e A254452 ..0..1..0..0..1....1..1..1..0..0....1..0..0..0..0....1..1..0..0..0 %e A254452 ..0..0..1..0..1....0..0..1..0..1....1..0..1..1..0....1..0..0..1..1 %K A254452 nonn %O A254452 1,1 %A A254452 _R. H. Hardin_, Jan 30 2015