A186578 Number of (n+2)X(n+2) 0..4 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock

1953125, 845, 23197, 441869, 1310469, 1673469, 2481269, 4583469, 11621669, 47205469, 171584469, 518633869, 1869857669, 5867355069, 16498082869, 56557420269

Offset

1,1

Comments

Diagonal of A186579

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for 4X4
..0..0..0..0....0..2..1..3....0..0..0..0....2..0..0..1....1..0..3..1
..0..0..0..0....0..0..2..1....0..0..0..0....0..2..0..0....3..1..0..3
..3..0..0..0....0..0..0..2....2..0..0..0....0..0..2..0....0..3..1..0
..0..0..0..0....0..0..0..0....4..0..0..0....3..0..0..2....1..0..3..1

Crossrefs

Sequence in context: A109147 A251299 A220290 * A186579 A290500 A016821

Adjacent sequences: A186575 A186576 A186577 * A186579 A186580 A186581

Keyword

nonn

Author

R. H. Hardin Feb 24 2011

Status

approved