A297451 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0 or 2 neighboring 1's.

2, 8, 92, 1677, 97005, 8800153, 2300975096, 1078420953679, 1299213136815377, 3046735975885152987, 17269379808592526211295, 200109250657229443895686946

Offset

1,1

Comments

Diagonal of A297457.

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Cf. A297457.

Sequence in context: A294194 A067964 A102895 * A295773 A319125 A297688

Adjacent sequences: A297448 A297449 A297450 * A297452 A297453 A297454

Keyword

nonn

Author

R. H. Hardin, Dec 30 2017

Status

approved