A201538 Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

18, 899, 72811, 9526987, 1408677515, 208164634003, 28456420346436, 3505159734744220, 387870239576486118, 38812326822498760643, 3543738686502556683539, 297838575975499416278867

Offset: 1

Author

R. H. Hardin Dec 02 2011

Keywords

• nonn

Comments

Column 7 of A201539

Examples

			Some solutions for n=3
..0..0..0..0..0..0..0....0..0..0..0..1..1..1....0..0..1..1..1..2..2
..0..1..1..1..1..1..2....0..0..0..1..1..2..2....1..1..2..2..2..1..2
..1..1..1..2..2..2..2....2..2..2..0..0..1..1....2..2..0..0..0..1..2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..14