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A186578
Number of (n+2)X(n+2) 0..4 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
0
1953125, 845, 23197, 441869, 1310469, 1673469, 2481269, 4583469, 11621669, 47205469, 171584469, 518633869, 1869857669, 5867355069, 16498082869, 56557420269
OFFSET
1,1
COMMENTS
Diagonal of A186579
EXAMPLE
Some solutions for 4X4
..0..0..0..0....0..2..1..3....0..0..0..0....2..0..0..1....1..0..3..1
..0..0..0..0....0..0..2..1....0..0..0..0....0..2..0..0....3..1..0..3
..3..0..0..0....0..0..0..2....2..0..0..0....0..0..2..0....0..3..1..0
..0..0..0..0....0..0..0..0....4..0..0..0....3..0..0..2....1..0..3..1
CROSSREFS
Sequence in context: A109147 A251299 A220290 * A186579 A290500 A016821
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 24 2011
STATUS
approved