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 A184563 #7 Jun 02 2025 03:49:07 %S A184563 25680486,102644935902,307926979784837,1027803541995894568, %T A184563 3319239109051464012589,10844219595929643673506107, %U A184563 35294057223652471936332160677,115019923806287297509943176811916 %N A184563 Number of (n+1)X9 0..2 arrays with no 2X2 subblock summing to less than 4. %C A184563 Column 8 of A184564 %H A184563 R. H. Hardin, <a href="/A184563/b184563.txt">Table of n, a(n) for n = 1..50</a> %e A184563 Some solutions for 3X9 %e A184563 ..0..0..0..0..0..0..2..2..2....0..0..0..0..0..0..2..0..2 %e A184563 ..2..2..2..2..2..2..1..2..1....2..2..2..2..2..2..2..2..1 %e A184563 ..0..0..0..0..2..0..2..1..2....0..0..0..0..2..2..1..0..2 %K A184563 nonn %O A184563 1,1 %A A184563 _R. H. Hardin_ Jan 17 2011