A297538 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1's.

1, 2, 35, 275, 12161, 3015179, 1610981344, 1479214192234, 4028895802966726, 43695679891258322395

Offset

1,2

Comments

Diagonal of A297544.

Links

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

Example

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

Crossrefs

Cf. A297544.

Sequence in context: A282727 A042353 A193576 * A089660 A058089 A055519

Adjacent sequences: A297535 A297536 A297537 * A297539 A297540 A297541

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved