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A186559
Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock
1
19683, 173, 1399, 8983, 21007, 29935, 47719, 82783, 168391, 441199, 1129591, 2679679, 6669991, 15566383, 34790167, 83037151, 194778055, 446546575, 1070609527, 2528845759, 5841194023, 13884206959, 32712096727, 75846181663
OFFSET
1,1
COMMENTS
Diagonal of A186568
LINKS
EXAMPLE
Some solutions for 4X4
..0..0..0..0....0..0..0..0....2..1..1..2....0..1..0..0....0..0..0..0
..0..0..0..0....0..0..0..0....1..2..1..1....0..0..1..0....1..0..0..0
..1..0..0..0....0..0..0..0....1..1..2..1....1..0..0..1....2..1..0..0
..2..0..0..0....1..1..1..1....2..1..1..2....0..1..0..0....1..2..1..0
CROSSREFS
Sequence in context: A234782 A206133 A321825 * A186568 A186560 A046322
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 23 2011
STATUS
approved