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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186568

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

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

Adjacent sequences:  A186556 A186557 A186558 * A186560 A186561 A186562

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 23 2011

STATUS

approved

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Last modified January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)