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A205423
Number of (n+1)X(n+1) 0..3 arrays with the number of equal 2X2 subblock diagonal pairs and equal antidiagonal pairs differing from each horizontal or vertical neighbor, and new values 0..3 introduced in row major order
0
15, 1662, 1093244, 3163254256, 42782998259850
OFFSET
1,1
COMMENTS
Diagonal of A205431
EXAMPLE
Some solutions for n=4
..0..0..0..1..1....0..1..1..1..2....0..0..0..0..0....0..0..0..1..1
..2..1..0..2..1....1..2..3..1..2....0..0..1..1..0....2..2..0..1..3
..3..2..3..0..0....2..1..2..1..1....0..2..1..0..1....1..2..1..0..3
..0..1..2..1..0....0..2..1..3..0....2..0..2..0..0....3..3..2..2..0
..2..0..3..2..3....2..0..3..1..3....0..3..3..2..3....2..3..2..2..3
CROSSREFS
Sequence in context: A208000 A182925 A208020 * A263600 A208860 A195891
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 27 2012
STATUS
approved