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 A232594 #6 Jul 23 2025 07:31:38 %S A232594 10,1686,332,41328,14398,1079300,595304,28339640,20864698,745382818, %T A232594 692444826,19631615242,21942354104,517768940660,675100038700, %U A232594 13674459254626,20329795464920,361635903700296,602407966781578 %N A232594 Number of (5+1)X(n+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or antidiagonally, with no adjacent elements equal. %C A232594 Row 5 of A232589 %H A232594 R. H. Hardin, <a href="/A232594/b232594.txt">Table of n, a(n) for n = 1..210</a> %e A232594 Some solutions for n=6 %e A232594 ..0..1..2..1..0..1..0....0..1..2..1..0..1..0....0..1..2..1..0..1..2 %e A232594 ..0..1..0..1..2..1..2....0..1..2..1..2..1..2....0..1..2..1..2..1..2 %e A232594 ..0..1..2..1..0..1..2....0..1..0..1..0..1..0....0..1..0..1..0..1..0 %e A232594 ..0..1..2..1..2..1..0....0..1..0..1..2..1..0....2..1..2..1..2..1..2 %e A232594 ..2..1..2..1..2..1..0....2..1..0..1..0..1..0....2..1..0..1..2..1..2 %e A232594 ..0..1..0..1..0..1..2....2..1..2..1..2..1..2....0..1..2..1..0..1..2 %K A232594 nonn %O A232594 1,1 %A A232594 _R. H. Hardin_, Nov 26 2013