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 A207430 #7 Jul 22 2025 20:25:37 %S A207430 21,441,3633,29929,341329,3892729,39698733,404854641,4315250265, %T A207430 45995236225,481815567745,5047180107649,53243344229835, %U A207430 561670803164025,5908341620443125,62151175576890625,654538444302027625 %N A207430 Number of 6Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically. %C A207430 Row 6 of A207426 %H A207430 R. H. Hardin, <a href="/A207430/b207430.txt">Table of n, a(n) for n = 1..210</a> %e A207430 Some solutions for n=4 %e A207430 ..1..0..0..1....1..1..0..1....0..0..1..1....0..1..1..1....1..0..0..1 %e A207430 ..1..1..0..1....1..0..1..1....0..1..1..0....1..0..1..1....1..1..1..1 %e A207430 ..1..1..0..0....0..1..1..1....0..1..1..0....1..1..0..1....1..1..1..0 %e A207430 ..1..0..0..1....1..1..0..0....0..1..1..0....1..1..0..1....0..1..1..1 %e A207430 ..1..1..0..1....1..0..0..1....0..1..1..0....1..0..0..1....1..0..0..1 %e A207430 ..1..1..0..1....1..1..0..1....0..1..1..0....1..0..0..1....1..0..1..1 %K A207430 nonn %O A207430 1,1 %A A207430 _R. H. Hardin_ Feb 17 2012