A297087 Number of n X n 0..1 arrays with no 1 adjacent to 3 king-move neighboring 1's.

2, 15, 228, 11925, 1850693, 859032804, 1280846320436, 6177627821053539, 97264292901092631884

Offset

1,1

Comments

Diagonal of A297094.

Links

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

Example

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

Crossrefs

Cf. A297094.

Sequence in context: A145168 A184357 A090301 * A247660 A197236 A097628

Adjacent sequences: A297084 A297085 A297086 * A297088 A297089 A297090

Keyword

nonn

Author

R. H. Hardin, Dec 25 2017

Status

approved