A282640 Number of n X n 0..1 arrays with no 1 equal to more than one of its king-move neighbors.

2, 11, 99, 2638, 133118, 15985259, 4257307148, 2506410920603, 3330699748741870, 9838180083513076754, 65038588812750477539631, 960673982564908731679446423, 31695946605234699442469207411170

Offset

1,1

Comments

Diagonal of A282647.

Links

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

Example

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

Crossrefs

Cf. A282647.

Sequence in context: A020559 A230889 A003579 * A099169 A143135 A205806

Adjacent sequences: A282637 A282638 A282639 * A282641 A282642 A282643

Keyword

nonn

Author

R. H. Hardin, Feb 20 2017

Status

approved