A305334 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 4, 12, 81, 1185, 30826, 1321695, 98008416, 12373093291, 2656799749952, 971390294075369, 604435523445204922, 640013417117018100841, 1153330960736161428690488

Offset

1,2

Comments

Diagonal of A305340.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A305340.

Sequence in context: A010370 A197852 A362384 * A205337 A359047 A263866

Adjacent sequences: A305331 A305332 A305333 * A305335 A305336 A305337

Keyword

nonn

Author

R. H. Hardin, May 30 2018

Status

approved