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A205346
Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the same number of equal edges as its horizontal or vertical neighbors, and new values 0..3 introduced in row major order
0
15, 1750, 1080457, 2423004172, 21200252524407
OFFSET
1,1
COMMENTS
Diagonal of A205352
EXAMPLE
Some solutions for n=4
..0..0..1..2..0....0..0..0..1..0....0..0..0..1..1....0..1..0..2..1
..3..0..2..3..3....0..0..2..3..3....2..0..0..0..2....3..0..0..1..0
..0..2..2..0..0....1..2..0..3..0....0..3..3..1..3....2..0..0..1..3
..0..0..3..2..1....0..1..0..3..1....1..3..3..1..0....3..2..1..3..3
..0..0..3..0..2....2..1..0..2..3....3..0..1..0..0....3..0..2..3..3
CROSSREFS
Sequence in context: A195521 A122184 A069450 * A208868 A070862 A077730
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 26 2012
STATUS
approved