A305948 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 23, 959, 126733, 52618569, 64233268442, 231757210785889, 2449990554327149088

Offset

1,2

Comments

Diagonal of A305954.

Links

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

Example

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

Crossrefs

Cf. A305954.

Sequence in context: A107765 A304413 A316240 * A317211 A145514 A305665

Adjacent sequences: A305945 A305946 A305947 * A305949 A305950 A305951

Keyword

nonn

Author

R. H. Hardin, Jun 15 2018

Status

approved