A305955 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 132, 11142, 2617757, 1909062568, 4251930563544, 29035257774709570, 607160473609338803438

Offset

1,2

Comments

Diagonal of A305961.

Links

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

Example

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

Crossrefs

Cf. A305961.

Sequence in context: A220257 A220321 A247597 * A377006 A051832 A103050

Adjacent sequences: A305952 A305953 A305954 * A305956 A305957 A305958

Keyword

nonn

Author

R. H. Hardin, Jun 15 2018

Status

approved