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 A186912 #7 Jul 22 2025 10:35:02 %S A186912 4028133387613,921058887545363,110909004238159456,8880688768983407407, %T A186912 522748636954347087650,23991605690718487651365, %U A186912 893383694291331850798966,27790825962428614280888055,738601710673817085331465603 %N A186912 Number of (n+2)X8 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order. %C A186912 Column 6 of A186915 %H A186912 R. H. Hardin, <a href="/A186912/b186912.txt">Table of n, a(n) for n = 1..19</a> %e A186912 Some solutions for 4X8 %e A186912 ..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..5....0..0..0..0..0..0..0..5 %e A186912 ..0..0..0..0..0..0..0..3....0..0..0..0..0..0..2..4....0..0..0..0..0..0..1..3 %e A186912 ..0..0..0..0..0..0..2..4....0..0..0..0..0..0..6..2....0..0..0..0..0..0..3..6 %e A186912 ..0..0..0..0..0..0..4..4....0..0..0..0..0..0..6..5....0..0..0..0..0..0..4..0 %K A186912 nonn %O A186912 1,1 %A A186912 _R. H. Hardin_ Feb 28 2011