A317005 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 96, 2567, 147281, 19006132, 5395769696, 3348077796513, 4557407875546295

Offset

1,2

Comments

Diagonal of A317011.

Links

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

Example

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

Crossrefs

Cf. A317011.

Sequence in context: A300474 A356590 A338571 * A002506 A367352 A318012

Adjacent sequences: A317002 A317003 A317004 * A317006 A317007 A317008

Keyword

nonn

Author

R. H. Hardin, Jul 18 2018

Status

approved