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Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order
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%I #5 Dec 18 2015 18:18:13

%S 1,1,7,203,580479,6423127757,22530453266592757

%N Number of horizontal, diagonal and antidiagonal neighbor colorings of the even squares of an n X n array with new integer colors introduced in row major order

%C Diagonal of A216460

%e Some solutions for n=4

%e ..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x

%e ..x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..3....x..2..x..3

%e ..3..x..1..x....3..x..4..x....4..x..0..x....3..x..4..x....0..x..1..x

%e ..x..4..x..2....x..5..x..2....x..1..x..3....x..1..x..2....x..4..x..0

%K nonn

%O 1,3

%A _R. H. Hardin_ Sep 07 2012