A281132 Number of n X n 0..2 arrays with no element equal to more than one of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 0, 297, 2368, 9484, 29408, 85874, 239368, 635490, 1614888, 3982412, 9598424, 22720722

Offset

1,3

Comments

Diagonal of A281139.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..0..1..0. .0..1..0..1. .0..0..1..0. .0..1..1..2. .0..0..1..0
..1..2..2..0. .2..1..2..1. .1..2..1..2. .2..2..0..2. .1..1..2..0
..1..0..1..0. .2..0..2..0. .0..2..0..2. .1..0..1..1. .2..0..2..1
..2..0..2..2. .0..1..2..1. .1..1..1..0. .1..0..2..2. .1..1..0..1

Crossrefs

Cf. A281139.

Sequence in context: A253035 A253029 A251289 * A200855 A200582 A200581

Adjacent sequences: A281129 A281130 A281131 * A281133 A281134 A281135

Keyword

nonn

Author

R. H. Hardin, Jan 15 2017

Status

approved