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

1,2

Comments

Column 7 of A240656.

Links

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

Example

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

Crossrefs

Cf. A240656.

Sequence in context: A285396 A113363 A223459 * A014903 A219308 A358698

Adjacent sequences: A240652 A240653 A240654 * A240656 A240657 A240658

Keyword

nonn

Author

R. H. Hardin, Apr 09 2014

Status

approved