A275177 Number of n X n 0..2 arrays with no element equal to any value at offset (-2,-1), (-1,0) or (-1,1) and new values introduced in order 0..2.

1, 4, 25, 141, 1465, 23313, 561044, 20397794, 1120217646, 93298660085, 11806084302586, 2272026396983803, 664988521276834246

Offset

1,2

Comments

Diagonal of A275183.

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for n=4
..0..0..1..2. .0..0..0..1. .0..0..0..1. .0..0..0..1. .0..0..0..1
..2..2..0..1. .2..2..2..0. .1..2..2..0. .1..2..2..0. .1..2..2..0
..0..1..2..2. .0..1..1..2. .0..1..1..2. .0..1..1..1. .0..1..1..2
..2..0..0..1. .2..0..0..1. .2..0..0..1. .2..0..0..0. .2..2..0..0

Crossrefs

Cf. A275183.

Sequence in context: A207410 A278275 A301836 * A079291 A173612 A349540

Adjacent sequences: A275174 A275175 A275176 * A275178 A275179 A275180

Keyword

nonn

Author

R. H. Hardin, Jul 19 2016

Status

approved