A316117 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 13, 56, 1109, 43480, 2525039, 351431316, 112149224917, 58115173076989

Offset

1,2

Comments

Diagonal of A316123.

Links

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

Example

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

Crossrefs

Cf. A316123.

Sequence in context: A009300 A192372 A304670 * A149477 A149478 A149479

Adjacent sequences: A316114 A316115 A316116 * A316118 A316119 A316120

Keyword

nonn

Author

R. H. Hardin, Jun 24 2018

Status

approved