A316809 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 227, 19816, 5391628, 4537910922, 11834952392431, 95718597001627353, 2398617698972252323323

Offset

1,2

Comments

Diagonal of A316815.

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..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0
..1..0..0..0..0. .1..0..0..1..0. .1..0..0..0..1. .1..0..0..1..1
..0..0..0..1..1. .1..0..1..1..1. .0..1..1..0..0. .1..1..0..0..0
..1..0..0..0..0. .1..0..1..0..0. .0..1..0..1..1. .1..1..1..0..0

Crossrefs

Cf. A316815.

Sequence in context: A189445 A193786 A213799 * A299655 A033508 A320365

Adjacent sequences: A316806 A316807 A316808 * A316810 A316811 A316812

Keyword

nonn

Author

R. H. Hardin, Jul 14 2018

Status

approved