A305476 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 10, 48, 277, 1558, 11438, 123104, 1894686, 36262397, 960587975, 37710956242, 1964623266399, 139733367823273

Offset

1,2

Comments

Diagonal of A305482.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A305482.

Sequence in context: A103932 A034190 A216390 * A270089 A336582 A271275

Adjacent sequences: A305473 A305474 A305475 * A305477 A305478 A305479

Keyword

nonn

Author

R. H. Hardin, Jun 02 2018

Status

approved