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A222683
Number of n X n 0..2 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..2 order
0
1, 3, 32, 3189, 419562, 589802909, 832227066041, 12257277646565165, 179723518209287846721, 27075363282358942396191388
OFFSET
1,2
COMMENTS
Diagonal of A222690
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..1....0..1..0....0..0..1....0..1..2
..0..0..0....0..0..1....0..0..0....0..1..1....1..1..1....1..0..0....1..1..1
..1..2..2....2..1..1....1..0..2....1..1..1....1..1..1....0..0..0....1..1..1
CROSSREFS
Sequence in context: A054780 A203323 A367565 * A134474 A096469 A106423
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 28 2013
STATUS
approved