A297648 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1's.

1, 10, 231, 11024, 2525244, 1906300826, 3863740405975, 26223048303944542, 618905182069042142432, 45235515405863464673598537

Offset

1,2

Comments

Diagonal of A297654.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A297654.

Sequence in context: A239772 A239773 A087434 * A012240 A295410 A188679

Adjacent sequences: A297645 A297646 A297647 * A297649 A297650 A297651

Keyword

nonn

Author

R. H. Hardin, Jan 02 2018

Status

approved