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 A207522 #7 Jul 22 2025 20:32:41 %S A207522 26,676,3910,23645,174224,1048423,5849409,34086388,194127326, %T A207522 1072682612,5949871197,32972259800,181215150437,994491836927, %U A207522 5459206940728,29912112343938,163735018314976,896261401236653,4904165437714290 %N A207522 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 0 and 1 0 1 vertically. %C A207522 Row 6 of A207519 %H A207522 R. H. Hardin, <a href="/A207522/b207522.txt">Table of n, a(n) for n = 1..210</a> %e A207522 Some solutions for n=4 %e A207522 ..0..1..1..0....0..1..1..1....0..1..1..1....0..1..1..1....1..0..1..1 %e A207522 ..0..1..1..1....0..0..0..0....0..1..1..0....1..0..1..1....0..1..1..0 %e A207522 ..0..1..1..1....1..0..0..0....1..0..0..0....1..0..0..0....0..1..1..0 %e A207522 ..1..0..1..1....1..0..1..1....1..0..0..0....1..1..0..0....1..1..1..1 %e A207522 ..1..0..1..1....0..1..1..1....0..0..0..0....0..1..1..0....1..1..1..1 %e A207522 ..0..1..1..0....0..1..1..1....0..0..0..0....0..1..1..0....1..0..0..0 %K A207522 nonn %O A207522 1,1 %A A207522 _R. H. Hardin_ Feb 18 2012