A316919 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 5, 13, 137, 6339, 533726, 493774680, 1580858618327, 13171868574537481

Offset

1,2

Comments

Diagonal of A316925.

Links

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

Example

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

Crossrefs

Cf. A316925.

Sequence in context: A005764 A358922 A305643 * A099974 A247820 A336097

Adjacent sequences: A316916 A316917 A316918 * A316920 A316921 A316922

Keyword

nonn

Author

R. H. Hardin, Jul 16 2018

Status

approved