A304663 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

1, 5, 13, 93, 832, 5101, 49516, 597306, 7738947, 148981944, 3876180802

Offset

1,2

Comments

Diagonal of A304669.

Links

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

Example

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

Crossrefs

Cf. A304669.

Sequence in context: A092567 A055623 A280294 * A306167 A107171 A309532

Adjacent sequences: A304660 A304661 A304662 * A304664 A304665 A304666

Keyword

nonn

Author

R. H. Hardin, May 16 2018

Status

approved