A317066 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 7, 153, 16910, 6661787, 9795822463, 53838648326109, 1105073018086192119, 84717348485283814164745, 24257389810894253781874213074

Offset

1,2

Comments

Diagonal of A317072.

Links

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

Example

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

Crossrefs

Cf. A317072.

Sequence in context: A305686 A356739 A006761 * A213798 A219102 A219981

Adjacent sequences: A317063 A317064 A317065 * A317067 A317068 A317069

Keyword

nonn

Author

R. H. Hardin, Jul 20 2018

Status

approved