A300676 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 5, 28, 398, 9015, 494771, 49274326, 10215309343, 4125004606007

Offset

1,2

Comments

Diagonal of A300682.

Links

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

Example

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

Crossrefs

Cf. A300682.

Sequence in context: A054388 A110255 A290330 * A016552 A321069 A355273

Adjacent sequences: A300673 A300674 A300675 * A300677 A300678 A300679

Keyword

nonn

Author

R. H. Hardin, Mar 11 2018

Status

approved