A297979 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

1, 5, 2, 15, 34, 131, 444, 1980, 6500, 36299, 183806, 1060708, 6012246, 38646743, 263315276, 2019852311

Offset

1,2

Comments

Diagonal of A297986.

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for n=7
..0..0..0..1..0..1..1. .0..1..0..0..0..1..0. .0..0..0..0..1..1..0
..0..1..1..0..1..0..1. .1..1..1..0..1..1..1. .0..1..1..0..1..0..0
..1..0..1..0..1..0..0. .0..0..0..0..0..0..0. .1..0..1..0..1..0..1
..1..0..1..0..1..0..1. .0..1..1..1..1..1..0. .1..0..1..0..1..1..1
..1..0..1..0..1..1..1. .1..0..0..0..0..0..1. .1..0..1..0..1..0..1
..1..0..1..0..1..0..1. .0..1..1..1..1..1..0. .1..0..1..0..1..0..0
..1..1..0..1..0..0..0. .0..0..0..0..0..0..0. .1..1..0..1..1..0..1

Crossrefs

Cf. A297986.

Sequence in context: A213550 A283242 A246209 * A298630 A248258 A279150

Adjacent sequences: A297976 A297977 A297978 * A297980 A297981 A297982

Keyword

nonn

Author

R. H. Hardin, Jan 10 2018

Status

approved