A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's.

1, 4, 24, 207, 5570, 261939, 20599895, 3819208252, 1400212345305, 937962844219314, 1312275096984570369, 3708386833907642906568, 20177474743877943669370721, 220442917573207336661039688056

Offset

1,2

Comments

Diagonal of A297224.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Cf. A297224.

Sequence in context: A050388 A241980 A368267 * A010039 A245407 A162314

Adjacent sequences: A297215 A297216 A297217 * A297219 A297220 A297221

Keyword

nonn

Author

R. H. Hardin, Dec 27 2017

Status

approved