A304262 Number of nX7 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 72, 61, 181, 772, 2516, 10024, 35769, 143364, 546403, 2127606, 8299219, 32202805, 125918125, 490459555, 1914519705, 7464476082, 29134292070, 113630849252, 443388799039, 1729833956517, 6748798176297, 26331366063005, 102730407728899

Offset

1,2

Comments

Column 7 of A304263.

Links

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

Example

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

Crossrefs

Cf. A304263.

Sequence in context: A347918 A035879 A033392 * A110678 A008943 A003898

Adjacent sequences: A304259 A304260 A304261 * A304263 A304264 A304265

Keyword

nonn

Author

R. H. Hardin, May 09 2018

Status

approved