A186911 Number of (n+2)X7 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

319741716426, 52666517720011, 4805827783188400, 300268014063911584, 14077041692560748494, 522748636954347087650, 15954040054059557650482, 411179480114108991321807, 9138537360691131917393508

Offset: 1

Author

R. H. Hardin Feb 28 2011

Keywords

• nonn

Comments

Column 5 of A186915

Examples

			Some solutions for 4X7
..0..0..0..0..0..0..2....0..0..0..0..0..1..2....0..0..0..0..0..0..2
..0..0..0..0..0..0..3....0..0..0..0..0..2..3....0..0..0..0..0..1..4
..0..0..0..0..0..4..0....0..0..0..0..0..5..4....0..0..0..0..0..1..4
..0..0..0..0..0..5..2....0..0..0..0..0..5..5....0..0..0..0..0..6..3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..120
• R. H. Hardin, Polynomial of degree 107

Formula

Polynomial of degree 107 in n, see link.