A299683 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 15, 648, 23116, 5740433, 4582634341, 9172624830461, 66764212816377961

Offset

1,2

Comments

Diagonal of A299689.

Links

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

Example

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

Crossrefs

Cf. A299689.

Sequence in context: A354462 A109923 A006524 * A341598 A295231 A070037

Adjacent sequences: A299680 A299681 A299682 * A299684 A299685 A299686

Keyword

nonn

Author

R. H. Hardin, Feb 16 2018

Status

approved