A304930 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

21, 237, 186, 842, 2265, 6426, 15993, 42032, 107527, 294610, 802939, 2150494, 5755142, 15441423, 41220407, 110573603, 297147846, 796997468, 2138394333, 5740020020, 15394935940, 41303582771, 110856414628, 297465011704

Offset

1,1

Comments

Column 7 of A304931.

Links

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

Example

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

Crossrefs

Cf. A304931.

Sequence in context: A173347 A360854 A303968 * A305346 A316614 A304668

Adjacent sequences: A304927 A304928 A304929 * A304931 A304932 A304933

Keyword

nonn

Author

R. H. Hardin, May 21 2018

Status

approved