A297513 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 3 neighboring 1's.

1, 5, 49, 624, 19187, 1995817, 424461759, 156485261895, 131486609293366, 286750273002748274, 1339067174781497822377

Offset

1,2

Comments

Diagonal of A297519.

Links

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

Example

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

Crossrefs

Cf. A297519.

Sequence in context: A112241 A216483 A243945 * A228511 A116873 A324361

Adjacent sequences: A297510 A297511 A297512 * A297514 A297515 A297516

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved