A304538 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 6 king-move adjacent elements, with upper left element zero.

1, 5, 9, 70, 461, 2558, 53098, 1991764, 96472384, 10666038086

Offset

1,2

Comments

Diagonal of A304544.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A304544.

Sequence in context: A347991 A179100 A358966 * A306123 A365580 A192202

Adjacent sequences: A304535 A304536 A304537 * A304539 A304540 A304541

Keyword

nonn

Author

R. H. Hardin, May 14 2018

Status

approved