A283851 Number of n X n 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors.

2, 16, 409, 35373, 10741381, 10634931992, 35481195059121, 402875332003637009, 15356708293578353570000, 1967963796346049662173630851, 850722520813357296311553404161550

Offset

1,1

Comments

Diagonal of A283857.

Links

Table of n, a(n) for n=1..11.

Example

Some solutions for n=4
..1..1..0..1. .0..1..0..1. .1..0..1..0. .0..1..0..1. .0..0..1..0
..1..0..1..1. .1..0..0..1. .0..0..0..0. .1..0..0..1. .1..0..0..0
..0..0..0..0. .0..1..1..0. .0..0..0..1. .0..0..0..1. .0..0..1..0
..0..0..1..0. .0..0..0..1. .1..1..1..1. .1..0..1..1. .0..1..0..1

Crossrefs

Cf. A283857.

Sequence in context: A189104 A347914 A181213 * A130276 A027871 A283408

Adjacent sequences: A283848 A283849 A283850 * A283852 A283853 A283854

Keyword

nonn

Author

R. H. Hardin, Mar 17 2017

Status

approved