A304761 Number of n X n 0..1 arrays with every element unequal to 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

0, 3, 16, 1321, 316639, 292676592, 969267512820, 11630662747620895, 503933308340733338752

Offset

1,2

Comments

Diagonal of A304767.

Links

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

Example

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

Crossrefs

Cf. A304767.

Sequence in context: A297118 A002794 A132559 * A316507 A317459 A080273

Adjacent sequences: A304758 A304759 A304760 * A304762 A304763 A304764

Keyword

nonn

Author

R. H. Hardin, May 18 2018

Status

approved