A305517 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

1, 8, 219, 16480, 3536750, 2122076804, 3592436519091, 17139689875149747, 230276333011388246524

Offset

1,2

Comments

Diagonal of A305523.

Links

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

Example

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

Crossrefs

Cf. A305523.

Sequence in context: A329304 A352471 A232157 * A298964 A298455 A055350

Adjacent sequences: A305514 A305515 A305516 * A305518 A305519 A305520

Keyword

nonn

Author

R. H. Hardin, Jun 04 2018

Status

approved