A281610 Number of 7Xn 0..2 arrays with no element equal to more than one of its horizontal, diagonal or antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

365, 52193, 736757, 32354824, 1421127262, 56764280423, 2352459742664, 97337283237331, 4014393674152359

Offset

1,1

Comments

Row 7 of A281605.

Links

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

Example

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

Crossrefs

Cf. A281605.

Sequence in context: A275357 A275147 A275227 * A233072 A275503 A275400

Adjacent sequences: A281607 A281608 A281609 * A281611 A281612 A281613

Keyword

nonn

Author

R. H. Hardin, Jan 25 2017

Status

approved