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A233201 Number of nX7 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabelled 8-colorings with no clashing color pairs).

%I A233201 #6 Jun 02 2025 08:52:29
%S A233201 1248,2098176,5496242176,15635845218304,46111939268444160,
%T A233201 138127371171167993856,416547612309880393695232,
%U A233201 1259808519497450508966166528,3814894993577338604838516162560
%N A233201 Number of nX7 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabelled 8-colorings with no clashing color pairs).
%C A233201 Column 7 of A233202
%H A233201 R. H. Hardin, <a href="/A233201/b233201.txt">Table of n, a(n) for n = 1..101</a>
%e A233201 Some solutions for n=2
%e A233201 ..0..1..0..2..6..5..0....0..1..0..2..6..3..7....0..1..0..2..7..3..2
%e A233201 ..3..2..6..3..7..1..3....3..2..6..3..5..1..4....2..4..6..4..2..6..4
%K A233201 nonn
%O A233201 1,1
%A A233201 _R. H. Hardin_, Dec 05 2013