A317216 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 133, 11378, 2762836, 2106680104, 4981964443017, 36636237693414092, 836922031617540197099

Offset

1,2

Comments

Diagonal of A317222.

Links

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

Example

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

Crossrefs

Cf. A317222.

Sequence in context: A251577 A082164 A229464 * A119670 A003374 A001533

Adjacent sequences: A317213 A317214 A317215 * A317217 A317218 A317219

Keyword

nonn

Author

R. H. Hardin, Jul 23 2018

Status

approved