A304674 Number of nX6 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

1, 49, 131, 598, 3525, 20932, 122388, 711362, 4369285, 26155072, 156304793, 943548083, 5679024203, 34141672780, 205491382920, 1237167747821, 7444659026254, 44802139128177, 269672072450366, 1623026776303690

Offset

1,2

Comments

Column 6 of A304676.

Links

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

Example

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

Crossrefs

Cf. A304676.

Sequence in context: A044681 A250311 A211727 * A257524 A020256 A304171

Adjacent sequences: A304671 A304672 A304673 * A304675 A304676 A304677

Keyword

nonn

Author

R. H. Hardin, May 16 2018

Status

approved