cp's OEIS Frontend

A233169 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs).

%I A233169 #8 Jun 02 2025 08:51:24
%S A233169 1,8,2688,7938048,221463445504,48667983827959808,
%T A233169 95229762257179140685824,1517114635517382193142028042240,
%U A233169 212050285595421539693130354498977398784,244891984772140151804896156943078190424499683328
%N A233169 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs).
%C A233169 Diagonal of A233174
%H A233169 R. H. Hardin, <a href="/A233169/b233169.txt">Table of n, a(n) for n = 1..13</a>
%e A233169 Some solutions for n=3
%e A233169 ..0..1..2....0..1..2....0..1..2....0..1..5....0..1..5....0..1..2....0..1..0
%e A233169 ..2..4..2....5..1..5....2..1..3....5..4..0....0..4..2....0..4..5....0..2..0
%e A233169 ..3..4..5....2..4..0....2..4..2....2..4..2....5..4..2....3..1..2....5..3..4
%K A233169 nonn
%O A233169 1,2
%A A233169 _R. H. Hardin_, Dec 05 2013