A298616 Number of n X n 0..1 arrays with every element equal to 1, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 4, 0, 83, 1893, 32834, 10823065, 4673855921, 3376311711594

Offset

1,2

Comments

Diagonal of A298622.

Links

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

Example

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

Crossrefs

Cf. A298622.

Sequence in context: A228557 A373766 A358294 * A366828 A337112 A357560

Adjacent sequences: A298613 A298614 A298615 * A298617 A298618 A298619

Keyword

nonn

Author

R. H. Hardin, Jan 23 2018

Status

approved