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A222449
Number of n X n 0..1 arrays with exactly floor(n X n/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.
0
1, 0, 2, 101, 1847, 161779, 17977932, 8774928190, 4427986390487, 10016765131595843
OFFSET
1,3
COMMENTS
Diagonal of A222456.
EXAMPLE
Some solutions for n=4
..0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..0....0..1..1..1
..0..0..1..0....0..0..0..0....0..0..0..1....0..0..0..1....0..1..1..1
..0..0..0..0....1..1..0..0....0..0..0..0....1..1..1..1....1..1..1..1
..0..0..0..0....1..1..0..0....0..0..1..0....1..1..1..1....0..1..1..1
CROSSREFS
Cf. A222456.
Sequence in context: A072383 A037053 A300102 * A035325 A266457 A028989
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 20 2013
STATUS
approved