A202977 Number of nX6 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

1, 31, 866, 17740, 379788, 8071997, 170937904, 3635245483, 77355342983, 1645059084851, 34980781489450, 743874666203318, 15818866015610506, 336395670890580933, 7153607521601342149, 152124673570902721461

Offset: 1

Author

R. H. Hardin Dec 26 2011

Keywords

• nonn

Comments

Column 6 of A202979

Examples

			Some solutions for n=4
..1..1..1..1..0..0....0..1..1..1..1..0....0..0..1..1..1..1....0..1..1..1..1..0
..1..1..1..1..1..1....1..1..1..1..1..1....1..1..1..1..0..1....1..1..0..1..1..1
..0..1..1..1..1..1....1..1..1..0..1..1....1..1..1..1..1..1....1..1..0..1..1..1
..0..1..1..0..1..1....1..1..0..0..0..0....0..1..1..1..0..0....0..1..1..1..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210