A240655 Number of n X 7 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order.

1, 21, 402, 7154, 118863, 2076117, 37066859, 666849212, 12062165754, 218944306666, 3980414427158, 72424065007263, 1318344476372801, 24003514023779867, 437093903871650760, 7959828410582705257

Offset: 1

Author

R. H. Hardin, Apr 09 2014

Keywords

• nonn

Comments

Column 7 of A240656.

Examples

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

Links

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

Crossrefs

Cf. A240656.