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A222787
Number of n X n 0..3 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..3 order
0
1, 3, 34, 5896, 1615706, 8113737592, 39461160617203, 3271351045573714833, 264112864034567015904268
OFFSET
1,2
COMMENTS
Diagonal of A222794
EXAMPLE
Some solutions for n=3
..0..0..0....0..0..0....0..0..0....0..0..1....0..1..1....0..0..0....0..0..0
..0..0..1....0..0..1....0..0..1....2..3..3....2..1..1....1..2..2....0..0..0
..0..0..2....2..0..0....1..0..0....3..3..3....1..1..1....2..2..2....1..0..2
CROSSREFS
Sequence in context: A194891 A194892 A182382 * A180126 A214854 A054287
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 05 2013
STATUS
approved