A296549 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 3 or 6 neighboring 1's.

1, 1, 2, 5, 11, 32, 148, 960, 6802, 58510, 718772, 11693848, 239151220, 6062327040, 203215388485

Offset

1,3

Comments

Diagonal of A296554.

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=7
..0..0..0..0..1..1..0. .0..0..0..0..0..0..0. .0..0..1..1..0..0..0
..0..0..0..1..1..1..0. .0..0..0..0..0..1..1. .0..1..1..1..0..1..1
..0..0..0..1..1..0..0. .0..0..0..0..1..1..1. .0..1..1..0..1..1..1
..0..0..0..0..0..1..1. .0..0..0..0..1..1..0. .0..0..0..0..1..1..0
..0..1..1..0..1..1..1. .0..0..0..0..0..0..0. .0..1..1..0..0..0..0
..1..1..1..0..1..1..0. .0..0..0..0..0..0..0. .1..1..1..0..0..0..0
..1..1..0..0..0..0..0. .0..0..0..0..0..0..0. .1..1..0..0..0..0..0

Crossrefs

Cf. A296554.

Sequence in context: A151395 A056364 A205799 * A379608 A056365 A276548

Adjacent sequences: A296546 A296547 A296548 * A296550 A296551 A296552

Keyword

nonn

Author

R. H. Hardin, Dec 15 2017

Status

approved