A301355 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 2, 13, 101, 1356, 44148, 3241470, 456790733, 132506438551, 79120923192740

Offset

1,2

Comments

Diagonal of A301361.

Links

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

Example

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

Crossrefs

Cf. A301361.

Sequence in context: A141116 A330349 A234299 * A077246 A365148 A371578

Adjacent sequences: A301352 A301353 A301354 * A301356 A301357 A301358

Keyword

nonn

Author

R. H. Hardin, Mar 19 2018

Status

approved