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 A207446 #7 Jul 22 2025 20:27:02 %S A207446 22,484,4048,32393,287176,2405923,19685415,162644898,1341574108, %T A207446 11023853716,90632253233,745371866818,6127014511151,50361384430983, %U A207446 413990430367770,3403011557477728,27971925637911848,229926213789709519 %N A207446 Number of 6Xn 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 0 vertically. %C A207446 Row 6 of A207442 %H A207446 R. H. Hardin, <a href="/A207446/b207446.txt">Table of n, a(n) for n = 1..210</a> %e A207446 Some solutions for n=4 %e A207446 ..0..1..1..1....1..0..0..0....0..1..1..1....1..0..0..0....1..1..0..1 %e A207446 ..1..1..0..0....0..1..1..0....1..1..0..1....1..1..0..0....1..1..0..0 %e A207446 ..1..1..1..1....1..0..0..0....1..1..1..1....1..0..0..0....1..1..0..1 %e A207446 ..0..0..0..0....1..1..1..0....1..0..0..0....1..1..0..0....0..0..0..0 %e A207446 ..1..1..1..1....1..0..0..0....0..1..1..1....0..0..0..0....1..1..0..1 %e A207446 ..1..0..0..0....1..1..1..0....1..1..1..0....1..1..0..0....1..1..0..0 %K A207446 nonn %O A207446 1,1 %A A207446 _R. H. Hardin_ Feb 17 2012