A316954 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 220, 16976, 3796326, 2402722112, 4359094468163, 22572190764246375, 333872791039707135291

Offset

1,2

Comments

Diagonal of A316960.

Links

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

Example

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

Crossrefs

Cf. A316960.

Sequence in context: A298455 A055350 A183261 * A299734 A006919 A179122

Adjacent sequences: A316951 A316952 A316953 * A316955 A316956 A316957

Keyword

nonn

Author

R. H. Hardin, Jul 17 2018

Status

approved