A186908 Number of (n+2) X 4 0..6 arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.

59969593, 2974946682, 99241308567, 2536761070723, 52666517720011, 921058887545363, 13921822487031205, 185414592506642580, 2208956268019713255, 23828517723857362267, 235072125997423449023

Offset: 1

Author

R. H. Hardin, Feb 28 2011

Keywords

• nonn

Comments

Column 2 of A186915.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200
• R. H. Hardin, Polynomial of degree 89

Crossrefs

Cf. A186915.

Formula

Polynomial of degree 89 in n, see link.