A304059 Number of n X n 0..1 arrays with every element unequal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

0, 3, 14, 661, 79185, 25507453, 23106300531, 55351295222420, 362287570737702640

Offset

1,2

Comments

Diagonal of A304065.

Links

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

Example

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

Crossrefs

Cf. A304065.

Sequence in context: A264748 A092987 A088334 * A305453 A305016 A316682

Adjacent sequences: A304056 A304057 A304058 * A304060 A304061 A304062

Keyword

nonn

Author

R. H. Hardin, May 05 2018

Status

approved