A304303 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

1, 8, 77, 1137, 26548, 989406, 55773947, 4882896349, 654105710575

Offset

1,2

Comments

Diagonal of A304310.

Links

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

Example

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

Crossrefs

Cf. A304310.

Sequence in context: A187638 A092661 A196071 * A074841 A272208 A136954

Adjacent sequences: A304300 A304301 A304302 * A304304 A304305 A304306

Keyword

nonn

Author

R. H. Hardin, May 10 2018

Status

approved