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A186573
Number of (n+2)X(n+2) 0..7 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
0
134217728, 3383, 335092, 17616908, 59508492, 69691980, 93739724, 178672908, 557336396, 3528280204
OFFSET
1,1
COMMENTS
Diagonal of A186574
EXAMPLE
Some solutions for 4X4
..0..0..7..2....0..0..0..0....0..0..4..3....0..0..0..0....0..1..0..0
..0..0..0..2....0..0..0..0....0..0..0..6....2..0..0..0....0..0..1..0
..0..0..0..0....0..0..0..0....0..0..0..0....6..2..0..0....5..0..0..1
..0..0..0..0....3..2..0..0....0..0..0..0....6..6..2..0....0..5..0..0
CROSSREFS
Sequence in context: A251400 A251281 A011577 * A186574 A017001 A017073
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 23 2011
STATUS
approved