A317267 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 13, 498, 31878, 3234635, 1396521994, 1165304769027, 2212187815200032

Offset

1,2

Comments

Diagonal of A317271.

Links

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

Example

Some solutions for n=5
..0..1..0..1..1. .0..1..1..1..0. .0..1..0..1..1. .0..1..1..1..1
..0..1..1..0..0. .1..0..0..0..1. .1..0..0..0..0. .1..0..1..0..0
..0..0..0..1..0. .1..1..1..1..1. .0..0..0..1..0. .1..1..1..1..1
..1..0..0..0..1. .0..1..1..0..0. .0..1..0..1..1. .0..1..1..0..1
..0..1..1..0..1. .1..0..0..1..1. .0..1..0..0..0. .1..0..1..1..0

Crossrefs

Cf. A317271.

Sequence in context: A304545 A316372 A306130 * A219366 A270638 A182439

Adjacent sequences: A317264 A317265 A317266 * A317268 A317269 A317270

Keyword

nonn

Author

R. H. Hardin, Jul 25 2018

Status

approved