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Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally
1

%I #6 Dec 18 2015 18:18:46

%S 1,15,1313,718483,2885285507,84130295708483,17291702408190208843,

%T 25164969879062538935257597,260198076410481338310694223844235,

%U 19101564590400937625024602276497985649471

%N Number of n X n 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally or antidiagonally

%C Diagonal of A232295

%H R. H. Hardin, <a href="/A232288/b232288.txt">Table of n, a(n) for n = 1..12</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 22 2013