A305770 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 81, 1481, 51586, 3492739, 453853629, 113299205109, 54481875961523

Offset

1,2

Comments

Diagonal of A305776.

Links

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

Example

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

Crossrefs

Cf. A305776.

Sequence in context: A138439 A193563 A026845 * A145921 A304655 A100399

Adjacent sequences: A305767 A305768 A305769 * A305771 A305772 A305773

Keyword

nonn

Author

R. H. Hardin, Jun 10 2018

Status

approved