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Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order
1

%I #6 Dec 18 2015 18:18:47

%S 1,11,941,342626,537122150,3584186808548,102515478543489824,

%T 12560894457658675727999,6600737461966058033047530086,

%U 14879494526383664062686710158410323

%N Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, top left element zero, and 1 appearing before 2 in row major order

%C Diagonal of A233098

%H R. H. Hardin, <a href="/A233092/b233092.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=3

%e ..0..0..1....0..1..0....0..1..0....0..1..3....0..0..1....0..1..0....0..1..0

%e ..2..0..0....0..2..3....0..0..0....3..2..0....2..0..0....0..1..3....3..1..3

%e ..2..2..2....0..1..0....1..1..0....0..2..0....0..0..1....3..2..0....3..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 04 2013