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A186872 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock 1
262144, 421, 6712, 79096, 214264, 287368, 443560, 801208, 1845448, 6154456, 19253080, 52715464, 160802104, 443095912, 1131273304, 3286379416, 9131561848, 24052744744, 69820713688, 195342687640, 520410211576, 1490887628248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A186881

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for 4X4

..0..3..3..0....0..0..0..3....0..0..0..0....0..2..1..1....0..1..1..2

..2..0..3..3....0..0..0..0....2..0..0..0....0..0..2..1....0..0..1..1

..2..2..0..3....0..0..0..0....0..2..0..0....0..0..0..2....0..0..0..1

..0..2..2..0....2..0..0..0....1..0..2..0....0..0..0..0....0..0..0..0

CROSSREFS

Sequence in context: A011568 A022534 A069393 * A186881 A186873 A018867

Adjacent sequences:  A186869 A186870 A186871 * A186873 A186874 A186875

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2011

STATUS

approved

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Last modified August 22 11:34 EDT 2019. Contains 326176 sequences. (Running on oeis4.)