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A233067 Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 in row major order 1

%I

%S 1,9,582,164495,194998895,975239425635,20656955820980290,

%T 1857471420698911806909,710147877110621514637926027,

%U 1155599363385647621950232861908393

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

%C Diagonal of A233073

%H R. H. Hardin, <a href="/A233067/b233067.txt">Table of n, a(n) for n = 1..11</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 03 2013

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Last modified January 22 23:50 EST 2022. Contains 350504 sequences. (Running on oeis4.)