A317224 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 46, 490, 17039, 929233, 98315821, 35202633059, 29277174452171, 53088150169443705

Offset

1,2

Comments

Diagonal of A317230.

Links

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

Example

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

Crossrefs

Cf. A317230.

Sequence in context: A352094 A037070 A141788 * A368269 A132113 A085299

Adjacent sequences: A317221 A317222 A317223 * A317225 A317226 A317227

Keyword

nonn

Author

R. H. Hardin, Jul 24 2018

Status

approved