A306054 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 27, 164, 3572, 99928, 3363541, 257823074, 35799252324, 7129093557510

Offset

1,2

Comments

Diagonal of A306060.

Links

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

Example

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

Crossrefs

Cf. A306060.

Sequence in context: A278358 A274751 A015534 * A218274 A061693 A005974

Adjacent sequences: A306051 A306052 A306053 * A306055 A306056 A306057

Keyword

nonn

Author

R. H. Hardin, Jun 18 2018

Status

approved