A304256 Number of n X n 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 8, 19, 116, 925, 10024, 185874, 4991758, 177599255

Offset

1,2

Comments

Diagonal of A304263.

Links

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

Example

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

Crossrefs

Cf. A304263.

Sequence in context: A170900 A151347 A047093 * A060305 A009141 A090069

Adjacent sequences: A304253 A304254 A304255 * A304257 A304258 A304259

Keyword

nonn

Author

R. H. Hardin, May 09 2018

Status

approved