A305686 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

0, 7, 152, 16658, 6433903, 9226209199, 49083436693252, 968465070692638039, 70872690892664520015992, 19236536201373166716419414330

Offset

1,2

Comments

Diagonal of A305692.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A305692.

Sequence in context: A277122 A351147 A351609 * A356739 A006761 A317066

Adjacent sequences: A305683 A305684 A305685 * A305687 A305688 A305689

Keyword

nonn,more

Author

R. H. Hardin, Jun 08 2018

Status

approved