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A233250 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally 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 A233250 #8 Jun 02 2025 08:52:43
%S A233250 1,10,4672,23896064,1159192379392,525597937107992576,
%T A233250 2242238966451009797226496,90075874398562137894702244954112,
%U A233250 34144912055691090021767126315871433129984
%N A233250 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally 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 A233250 Diagonal of A233256
%H A233250 R. H. Hardin, <a href="/A233250/b233250.txt">Table of n, a(n) for n = 1..15</a>
%e A233250 Some solutions for n=3
%e A233250 ..0..1..2....0..1..2....0..1..2....0..1..5....0..1..0....0..1..0....0..1..0
%e A233250 ..3..5..3....2..5..3....2..0..3....0..1..5....5..1..5....2..1..2....2..1..5
%e A233250 ..3..4..5....3..4..5....1..5..3....5..2..5....2..4..3....3..0..3....5..2..5
%K A233250 nonn
%O A233250 1,2
%A A233250 _R. H. Hardin_, Dec 06 2013