A185426 Number of (n+2)X(n+2) 0..7 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

6842284, 21536560306, 84722449466168, 378372621022753476, 1812817799965228636502, 9008824580891342846197566, 45497009931939204350899288292

Offset

1,1

Comments

Diagonal of A185435

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4X4
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..4....0..0..0..0....0..0..0..0....0..0..0..4....0..0..0..4
..0..1..5..2....0..1..4..6....0..0..0..2....0..0..7..3....0..0..6..6
..0..3..7..5....0..2..7..1....2..4..6..5....0..5..4..5....0..7..2..0

Crossrefs

Sequence in context: A372085 A185435 A185427 * A250457 A251982 A323497

Adjacent sequences: A185423 A185424 A185425 * A185427 A185428 A185429

Keyword

nonn

Author

R. H. Hardin Jan 27 2011

Status

approved