A186571 Number of (n+2)X(n+2) 0..6 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock

40353607, 2295, 155811, 6144163, 20145619, 24109915, 33341515, 63091963, 185353627, 1030573051, 4642181947, 16031111611

Offset

1,1

Comments

Diagonal of A186572

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for 4X4
..5..1..4..5....0..6..6..0....0..0..0..0....2..0..0..0....0..1..4..3
..4..5..1..4....3..0..6..6....4..0..0..0....0..0..0..0....0..0..1..4
..1..4..5..1....3..3..0..6....1..4..0..0....0..0..0..0....0..0..0..1
..5..1..4..5....0..3..3..0....1..1..4..0....0..0..0..4....0..0..0..0

Crossrefs

Sequence in context: A218390 A186617 A186960 * A186572 A016929 A016989

Adjacent sequences: A186568 A186569 A186570 * A186572 A186573 A186574

Keyword

nonn

Author

R. H. Hardin Feb 23 2011

Status

approved