A317061 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 25, 1595, 384535, 354399907, 1197129513001, 14769904681663624, 663063103032213149999

Offset

1,2

Comments

Diagonal of A317065.

Links

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

Example

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

Crossrefs

Cf. A317065.

Sequence in context: A014253 A132553 A305679 * A144229 A316926 A317699

Adjacent sequences: A317058 A317059 A317060 * A317062 A317063 A317064

Keyword

nonn

Author

R. H. Hardin, Jul 20 2018

Status

approved