A281658 Number of 6Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 20444, 982206, 32771472, 1205962480, 37763465272, 1154703692514, 34504258166264, 1006968332779830, 28949112532504572

Offset

1,2

Comments

Row 6 of A281653.

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=2
..0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..1. .0..0. .0..0
..0..2. .1..2. .1..1. .1..1. .1..1. .0..1. .0..2. .2..1. .0..1. .0..1
..0..1. .0..0. .2..2. .0..2. .0..2. .1..0. .0..1. .2..2. .0..1. .2..1
..1..1. .2..2. .0..0. .2..1. .2..0. .2..0. .1..1. .1..0. .0..1. .2..0
..0..2. .0..1. .2..2. .2..1. .1..0. .1..0. .2..1. .0..1. .2..2. .1..1
..0..1. .0..0. .0..1. .2..1. .1..2. .1..1. .0..1. .0..2. .1..0. .2..2

Crossrefs

Cf. A281653.

Sequence in context: A269279 A234552 A223466 * A234304 A242619 A224619

Adjacent sequences: A281655 A281656 A281657 * A281659 A281660 A281661

Keyword

nonn

Author

R. H. Hardin, Jan 26 2017

Status

approved