A300466 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 8, 160, 8608, 1231578, 462538206, 456303004550, 1184061531948168, 8081950028633306006, 145086737722751262521230, 6849888315993282295524030922

Offset

1,2

Comments

Diagonal of A300472.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A300472.

Sequence in context: A221077 A052140 A219265 * A184605 A195607 A064755

Adjacent sequences: A300463 A300464 A300465 * A300467 A300468 A300469

Keyword

nonn

Author

R. H. Hardin, Mar 06 2018

Status

approved