A299662 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 179, 10363, 1585983, 615314145, 613943466291, 1591211266257849, 10629604983387803644

Offset

1,2

Comments

Diagonal of A299668.

Links

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

Example

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

Crossrefs

Cf. A299668.

Sequence in context: A089456 A298995 A299742 * A300255 A108552 A221589

Adjacent sequences: A299659 A299660 A299661 * A299663 A299664 A299665

Keyword

nonn

Author

R. H. Hardin, Feb 15 2018

Status

approved