A301535 Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.

1, 3, 9, 79, 658, 10783, 255406, 9891331, 588765472, 55421789236, 8214384910527

Offset

1,2

Comments

Diagonal of A301541.

Links

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

Example

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

Crossrefs

Cf. A301541.

Sequence in context: A132294 A032330 A018604 * A215712 A000218 A139731

Adjacent sequences: A301532 A301533 A301534 * A301536 A301537 A301538

Keyword

nonn

Author

R. H. Hardin, Mar 23 2018

Status

approved