A306160 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 17, 103, 1188, 25226, 842280, 47632142, 4469582265, 707797981908, 187189348152519, 82725002911322885

Offset

1,2

Comments

Diagonal of A306166.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A306166.

Sequence in context: A128321 A290352 A091635 * A127676 A335626 A232211

Adjacent sequences: A306157 A306158 A306159 * A306161 A306162 A306163

Keyword

nonn

Author

R. H. Hardin, Jun 23 2018

Status

approved