A318069 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 6, 18, 73, 316, 3029, 46884, 935951, 38183961, 2877277695, 323244675173, 63938089963412, 22744080515948233, 13243562482553493420

Offset

1,2

Comments

Diagonal of A318075.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A318075.

Sequence in context: A129790 A121156 A057051 * A332939 A299412 A218080

Adjacent sequences: A318066 A318067 A318068 * A318070 A318071 A318072

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved