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 A232341 #6 Jul 23 2025 07:19:50 %S A232341 1,754,22228,76630,2510674,9298730,318521414,1241196022,41049614014, %T A232341 168217753216,5314116600322,22881089512316,689018292976294, %U A232341 3108875283706072,89394192873266794,421515136439868122 %N A232341 Number of 7Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally, with no adjacent elements equal. %C A232341 Row 7 of A232335 %H A232341 R. H. Hardin, <a href="/A232341/b232341.txt">Table of n, a(n) for n = 1..210</a> %e A232341 Some solutions for n=4 %e A232341 ..2..1..2..1....2..1..0..1....2..0..1..2....0..1..0..1....0..1..0..1 %e A232341 ..0..1..2..1....2..1..2..0....1..2..1..0....2..1..2..1....2..1..2..1 %e A232341 ..0..1..2..1....2..0..1..2....1..2..1..2....0..1..0..2....2..1..2..1 %e A232341 ..0..1..0..2....1..2..0..2....1..2..0..1....0..1..0..1....0..1..2..1 %e A232341 ..0..2..1..2....0..1..0..1....0..1..2..1....2..1..2..1....2..1..2..1 %e A232341 ..1..2..1..2....2..1..2..1....0..1..0..2....2..1..2..1....2..1..2..1 %e A232341 ..1..0..1..2....2..1..0..2....2..1..0..2....0..1..0..2....2..1..0..2 %K A232341 nonn %O A232341 1,2 %A A232341 _R. H. Hardin_, Nov 22 2013