A186087 Number of (n+2)X(n+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

102251, 22559052, 4527262140, 837192826927, 142701733009836, 22643128901373831, 3389319838308873682, 482195323502778740280, 65081669155365981380613, 8294413388145189171875895

Offset

1,1

Comments

Diagonal of A186096

Links

Table of n, a(n) for n=1..10.

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..1..2....0..0..0..1....0..0..1..3....0..0..0..3....0..0..1..3
..0..2..2..4....0..0..1..2....0..1..0..2....0..2..3..3....0..1..1..1
..3..4..2..4....3..3..0..1....0..4..3..0....2..4..3..1....2..4..2..3

Crossrefs

Sequence in context: A106813 A186096 A186088 * A106814 A220076 A235694

Adjacent sequences: A186084 A186085 A186086 * A186088 A186089 A186090

Keyword

nonn

Author

R. H. Hardin Feb 12 2011

Status

approved