A304698 Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

0, 3, 8, 48, 908, 47440, 3510334, 799135415, 758781064050

Offset

1,2

Comments

Diagonal of A304704.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A304704.

Sequence in context: A003216 A366755 A146161 * A306598 A019015 A305217

Adjacent sequences: A304695 A304696 A304697 * A304699 A304700 A304701

Keyword

nonn

Author

R. H. Hardin, May 17 2018

Status

approved