A317691 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 14, 141, 6984, 585418, 526480617, 1721401739325, 14558324850764323

Offset

1,2

Comments

Diagonal of A317697.

Links

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

Example

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

Crossrefs

Cf. A317697.

Sequence in context: A027304 A070135 A317037 * A067857 A027832 A128946

Adjacent sequences: A317688 A317689 A317690 * A317692 A317693 A317694

Keyword

nonn

Author

R. H. Hardin, Aug 04 2018

Status

approved