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A230969
Number of (n+2)X(n+2) 0..3 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero
0
0, 144, 13872, 6170256, 11094079744, 66985909298064, 1388708377137781120, 101290675055736816040000, 25961188014463809661357637024, 23330456050837373777439681163833600
OFFSET
1,2
COMMENTS
Diagonal of A230977
EXAMPLE
Some solutions for n=2
..0..2..0..2....0..3..0..3....0..1..0..1....0..1..0..3....0..3..0..1
..1..1..3..3....2..1..0..3....2..1..2..3....2..1..0..3....0..1..2..1
..2..0..0..2....0..1..2..3....2..3..0..1....2..3..0..3....0..1..2..1
..3..3..1..3....0..3..0..1....2..3..0..3....2..3..2..3....0..3..0..1
CROSSREFS
Sequence in context: A182913 A231697 A238932 * A252779 A238284 A249181
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 02 2013
STATUS
approved