A299568 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 78, 766, 17389, 784334, 46965400, 5736969146, 1349947112124

Offset

1,2

Comments

Diagonal of A299574.

Links

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

Example

Some solutions for n=6
..0..1..0..0..0..1. .0..1..1..0..1..0. .0..1..0..0..0..1. .0..0..0..0..1..0
..0..0..1..1..1..0. .0..0..0..0..1..0. .0..0..1..1..1..0. .1..0..0..0..0..1
..0..0..1..1..1..0. .1..1..0..0..0..1. .0..0..1..1..1..1. .0..1..1..1..1..0
..1..0..1..1..1..0. .0..0..0..0..0..1. .0..0..1..1..1..1. .0..1..1..1..0..1
..1..1..1..0..1..1. .1..0..0..0..0..1. .0..0..1..0..1..1. .0..1..1..1..1..0
..0..0..0..1..0..0. .1..1..0..0..1..0. .0..1..1..0..0..1. .1..0..0..0..0..1

Crossrefs

Cf. A299574.

Sequence in context: A297952 A298771 A298576 * A031884 A337284 A186942

Adjacent sequences: A299565 A299566 A299567 * A299569 A299570 A299571

Keyword

nonn

Author

R. H. Hardin, Feb 13 2018

Status

approved