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 A232375 #6 Jul 23 2025 07:22:21 %S A232375 48,19448,2046700,219597458,24945468636,2824295623804,319646954776850, %T A232375 36234058732024820,4107330198377776652,465585399247158982768, %U A232375 52778440824390526548132,5982947009339446194736266 %N A232375 Number of nX7 0..3 arrays with every 0 next to a 1, every 1 next to a 2 and every 2 next to a 3 horizontally, diagonally or antidiagonally, and no adjacent values equal. %C A232375 Column 7 of A232376 %H A232375 R. H. Hardin, <a href="/A232375/b232375.txt">Table of n, a(n) for n = 1..210</a> %e A232375 Some solutions for n=2 %e A232375 ..2..1..0..3..0..1..3....0..1..2..3..1..2..1....2..1..0..1..2..3..2 %e A232375 ..0..3..2..3..2..1..3....0..3..2..0..1..0..3....0..3..0..3..2..1..0 %K A232375 nonn %O A232375 1,1 %A A232375 _R. H. Hardin_, Nov 23 2013