A298576 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 15, 78, 765, 16521, 708805, 40964223, 4776371282, 1079598223972

Offset

1,2

Comments

Diagonal of A298582.

Links

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

Example

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

Crossrefs

Cf. A298582.

Sequence in context: A104530 A297952 A298771 * A299568 A031884 A337284

Adjacent sequences: A298573 A298574 A298575 * A298577 A298578 A298579

Keyword

nonn

Author

R. H. Hardin, Jan 22 2018

Status

approved