A306047 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 45, 458, 12349, 554682, 36596835, 8395262149, 4973359586800, 4903224406630694

Offset

1,2

Comments

Diagonal of A306053.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A306053.

Sequence in context: A120044 A328885 A002686 * A110348 A336999 A296945

Adjacent sequences: A306044 A306045 A306046 * A306048 A306049 A306050

Keyword

nonn

Author

R. H. Hardin, Jun 18 2018

Status

approved