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 A183686 #7 Jul 22 2025 09:09:15 %S A183686 384,3472,28160,239424,1992320,16748160,140090240,1174759296, %T A183686 9838208512,82449830016,690711971456,5787565930752,48489078457728, %U A183686 406275347589248,3403932556101120,28520064001053824,238954333647573120 %N A183686 Number of (n+1)X8 binary arrays with every 2X2 subblock nonsingular. %C A183686 Column 7 of A183688 %H A183686 R. H. Hardin, <a href="/A183686/b183686.txt">Table of n, a(n) for n = 1..200</a> %F A183686 Empirical: a(n)=7*a(n-1)+57*a(n-2)-332*a(n-3)-1122*a(n-4)+5412*a(n-5)+9248*a(n-6)-35984*a(n-7)-26624*a(n-8)+82304*a(n-9) %e A183686 Some solutions for 3X8 %e A183686 ..0..1..1..1..1..1..1..1....0..1..0..1..0..1..0..1....1..1..1..0..1..0..1..1 %e A183686 ..1..0..1..0..1..0..1..0....1..0..1..1..1..1..1..1....1..0..1..1..0..1..0..1 %e A183686 ..0..1..1..1..0..1..0..1....0..1..1..0..1..0..1..0....0..1..0..1..1..1..1..1 %K A183686 nonn %O A183686 1,1 %A A183686 _R. H. Hardin_ Jan 06 2011