A299669 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 94, 2009, 131420, 17105490, 4670821739, 3777344294506, 6940995630452984

Offset

1,2

Comments

Diagonal of A299675.

Links

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

Example

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

Crossrefs

Cf. A299675.

Sequence in context: A098269 A010565 A299002 * A080208 A297857 A298092

Adjacent sequences: A299666 A299667 A299668 * A299670 A299671 A299672

Keyword

nonn

Author

R. H. Hardin, Feb 16 2018

Status

approved