A300770 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 3, 36, 1536, 116954, 27354464, 16992197390, 27071152148341, 112124137590207769

Offset

1,3

Comments

Diagonal of A300776.

Links

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

Example

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

Crossrefs

Cf. A300776.

Sequence in context: A102921 A265475 A233197 * A272660 A193302 A289315

Adjacent sequences: A300767 A300768 A300769 * A300771 A300772 A300773

Keyword

nonn

Author

R. H. Hardin, Mar 12 2018

Status

approved