A281337 Number of n X n 0..1 arrays with no element equal to more than three of its king-move neighbors and with new values introduced in order 0 sequentially upwards.

1, 8, 68, 607, 6256, 63168, 639142, 6658147, 71489598, 791069059, 9041456464, 108750132498

Offset

1,2

Comments

Diagonal of A281344.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A281344.

Sequence in context: A190510 A282563 A163307 * A152105 A068766 A233736

Adjacent sequences: A281334 A281335 A281336 * A281338 A281339 A281340

Keyword

nonn

Author

R. H. Hardin, Jan 20 2017

Status

approved