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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, vertically or antidiagonally
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%I #5 Dec 18 2015 18:18:46

%S 1,37,5149,6363511,66287652717,5637591065064585,

%T 3953611274692252664219,22845060732287997693078487339,

%U 1087328305739985850553848837289874701,426327214385010895269748977017138080515645751

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

%C Diagonal of A232309

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Nov 22 2013