A305361 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 39, 398, 7196, 179644, 8803975, 615439372, 69977566829, 13294810916472

Offset

1,2

Comments

Diagonal of A305367.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A305367.

Sequence in context: A207154 A203111 A198048 * A202763 A035357 A207152

Adjacent sequences: A305358 A305359 A305360 * A305362 A305363 A305364

Keyword

nonn

Author

R. H. Hardin, May 31 2018

Status

approved