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 A188703 #7 Jul 22 2025 11:19:05 %S A188703 64,377,7164,71152,986929,11462588,145764780,1769780565,21988745988, %T A188703 270110390804,3336423566677,41102425332512,506994024857925, %U A188703 6249982640820369,77068431918058476,950205205067610609 %N A188703 Number of nX6 binary arrays without the pattern 0 0 diagonally or vertically. %C A188703 Column 6 of A188706 %H A188703 R. H. Hardin, <a href="/A188703/b188703.txt">Table of n, a(n) for n = 1..200</a> %F A188703 Empirical: a(n) = a(n-1) +119*a(n-2) +397*a(n-3) -1395*a(n-4) -5213*a(n-5) +8797*a(n-6) +24443*a(n-7) -36756*a(n-8) -45888*a(n-9) +84092*a(n-10) +19388*a(n-11) -83412*a(n-12) +24912*a(n-13) +22741*a(n-14) -12257*a(n-15) -1459*a(n-16) +1607*a(n-17) -49*a(n-18) -71*a(n-19) +3*a(n-20) +a(n-21) %e A188703 Some solutions for 3X6 %e A188703 ..1..1..1..1..0..1....0..1..0..1..0..1....0..0..0..1..1..0....0..0..1..0..1..1 %e A188703 ..0..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..1..1 %e A188703 ..1..1..1..1..1..0....0..1..0..1..0..0....1..1..1..1..0..1....0..1..0..0..1..0 %K A188703 nonn %O A188703 1,1 %A A188703 _R. H. Hardin_ Apr 08 2011