A317452 Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 17, 72, 4364, 165890, 14872138, 5301169782, 6077202952491

Offset

1,2

Comments

Diagonal of A317458.

Links

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

Example

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

Crossrefs

Cf. A317458.

Sequence in context: A241776 A270231 A265919 * A128948 A342364 A049181

Adjacent sequences: A317449 A317450 A317451 * A317453 A317454 A317455

Keyword

nonn

Author

R. H. Hardin, Jul 28 2018

Status

approved