A304301 Number of nX7 0..1 arrays with every element unequal to 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

8, 22, 22, 43, 339, 685, 2673, 11690, 31390, 133744, 470762, 1540068, 6102146, 20842217, 73878439, 275427095, 956546292, 3458032571, 12531328029, 44267349424, 160026929357, 574345404117, 2048047347778, 7378617219463

Offset

1,1

Comments

Column 7 of A304302.

Links

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

Example

Some solutions for n=5
..0..1..0..0..0..0..0. .0..0..0..0..0..0..0. .0..0..0..1..0..1..0
..0..0..0..1..0..0..1. .1..0..0..1..0..1..0. .1..0..0..0..0..0..0
..1..0..0..0..0..0..0. .0..0..0..0..0..0..0. .0..0..0..0..0..0..1
..0..0..0..0..0..0..1. .0..1..0..0..0..0..1. .1..0..0..1..0..0..0
..0..1..0..0..1..0..0. .0..0..0..0..1..0..0. .0..0..0..0..0..1..0

Crossrefs

Cf. A304302.

Sequence in context: A323593 A013630 A215600 * A236917 A064193 A301482

Adjacent sequences: A304298 A304299 A304300 * A304302 A304303 A304304

Keyword

nonn

Author

R. H. Hardin, May 10 2018

Status

approved