A297500 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 2 neighboring 1's.

1, 10, 110, 2281, 270845, 66289769, 28914051279, 44145856928170, 190314910908111935, 1690602288933775004206, 41411616264665765678770302

Offset

1,2

Comments

Diagonal of A297506.

Links

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

Example

Some solutions for n=4
..0..0..1..1. .1..1..1..0. .0..1..1..1. .0..0..1..0. .0..0..1..1
..0..0..0..0. .0..0..0..1. .0..0..0..0. .1..1..0..0. .0..0..1..0
..1..1..0..0. .0..1..0..1. .1..1..1..0. .0..0..0..0. .1..0..0..1
..1..0..0..0. .0..0..1..0. .0..0..0..1. .1..1..1..0. .0..1..1..0

Crossrefs

Cf. A297506.

Sequence in context: A099883 A337351 A146753 * A305213 A181929 A339713

Adjacent sequences: A297497 A297498 A297499 * A297501 A297502 A297503

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved