A297389 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

1, 5, 19, 126, 3175, 99682, 4279111, 540319235, 108762242579, 33338094951563, 23051383345794169, 28507330662583210289, 58989477569892970363690, 240856095225813296736743615

Offset

1,2

Comments

Diagonal of A297395.

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Cf. A297395.

Sequence in context: A354863 A328060 A366340 * A228479 A354843 A187018

Adjacent sequences: A297386 A297387 A297388 * A297390 A297391 A297392

Keyword

nonn

Author

R. H. Hardin, Dec 29 2017

Status

approved