A186872 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock

262144, 421, 6712, 79096, 214264, 287368, 443560, 801208, 1845448, 6154456, 19253080, 52715464, 160802104, 443095912, 1131273304, 3286379416, 9131561848, 24052744744, 69820713688, 195342687640, 520410211576, 1490887628248

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