A304142 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

0, 7, 18, 61, 1198, 13152, 6492, 1429403, 180869894, 605470336, 33123913586

Offset

1,2

Comments

Diagonal of A304149.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A304149.

Sequence in context: A197092 A288743 A223240 * A019534 A024830 A262489

Adjacent sequences: A304139 A304140 A304141 * A304143 A304144 A304145

Keyword

nonn

Author

R. H. Hardin, May 07 2018

Status

approved