A296398 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 3 neighboring 1's.

1, 4, 24, 444, 35561, 6200926, 3068113721, 4427644444522, 16720185055951726, 174611744359086830290, 5039863866276836681199376

Offset

1,2

Comments

Diagonal of A296405.

Links

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

Example

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

Crossrefs

Cf. A296405.

Sequence in context: A247737 A326871 A012945 * A166947 A103624 A101952

Adjacent sequences: A296395 A296396 A296397 * A296399 A296400 A296401

Keyword

nonn

Author

R. H. Hardin, Dec 11 2017

Status

approved