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 A186127 #7 Jul 22 2025 10:15:51 %S A186127 678,14606,120290,1574348,17129792,220010616,2630528360,33067061342, %T A186127 411149162658,5153688541776,64828282889916,815418585280038, %U A186127 10288257115910818,129785918260715398,1639362506927114546 %N A186127 Number of (n+1)X9 binary arrays with every 2X2 subblock diagonal sum less antidiagonal sum equal to some horizontal or vertical neighbor 2X2 subblock diagonal sum less antidiagonal sum. %C A186127 Column 8 of A186128 %H A186127 R. H. Hardin, <a href="/A186127/b186127.txt">Table of n, a(n) for n = 1..20</a> %e A186127 Some solutions for 3X9 %e A186127 ..1..1..0..0..1..0..0..1..1....1..1..0..1..1..0..0..1..1 %e A186127 ..1..1..1..0..0..0..1..1..1....0..0..0..1..1..1..0..0..0 %e A186127 ..0..0..1..0..0..1..1..0..0....0..0..1..1..0..1..1..0..0 %K A186127 nonn %O A186127 1,1 %A A186127 _R. H. Hardin_ Feb 13 2011