A297014 Number of n X n 0..1 arrays with each 1 adjacent to 3, 4 or 6 king-move neighboring 1's.

1, 2, 8, 46, 852, 74534, 11172600, 5380073625, 8482089381228

Offset

1,2

Comments

Diagonal of A297020.

Links

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

Example

Some solutions for n=6
..1..1..0..1..1..0. .1..1..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..1..0
..1..1..1..0..1..1. .1..1..1..0..1..0. .0..1..1..1..1..1. .0..0..0..1..1..0
..0..1..1..1..1..1. .0..0..0..1..1..1. .1..1..1..0..1..1. .0..0..1..0..0..0
..0..0..0..0..0..0. .0..0..1..0..0..1. .1..1..0..1..0..1. .0..1..0..1..1..1
..1..1..1..1..1..0. .0..1..1..0..1..1. .0..0..0..1..1..1. .1..1..0..0..1..1
..1..1..0..1..1..0. .0..0..1..1..1..0. .0..0..0..0..1..1. .1..1..0..0..0..0

Crossrefs

Cf. A297020.

Sequence in context: A099765 A246386 A096656 * A102009 A254747 A298698

Adjacent sequences: A297011 A297012 A297013 * A297015 A297016 A297017

Keyword

nonn

Author

R. H. Hardin, Dec 23 2017

Status

approved