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 A207429 #7 Jul 22 2025 20:25:30 %S A207429 14,196,1162,6889,55361,444889,3210938,23174596,174570082,1315005169, %T A207429 9738102283,72114268681,537769464960,4010246553600,29819994798720, %U A207429 221740004737969,1650780521420653,12289511462408761,91447279848789522 %N A207429 Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically. %C A207429 Row 5 of A207426 %H A207429 R. H. Hardin, <a href="/A207429/b207429.txt">Table of n, a(n) for n = 1..210</a> %e A207429 Some solutions for n=4 %e A207429 ..1..0..1..1....0..1..1..0....0..1..1..1....0..0..1..1....0..0..1..1 %e A207429 ..0..0..1..1....1..1..1..0....1..0..0..1....1..1..0..0....0..1..1..1 %e A207429 ..1..0..0..1....1..1..1..0....1..1..0..1....1..1..1..0....0..1..1..1 %e A207429 ..1..0..0..1....0..1..1..0....1..1..0..1....1..1..1..0....0..1..1..1 %e A207429 ..1..0..0..1....1..1..0..0....1..1..0..1....1..1..0..0....0..1..1..1 %K A207429 nonn %O A207429 1,1 %A A207429 _R. H. Hardin_ Feb 17 2012