A210099 Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock having one or three distinct values, and new values 0..2 introduced in row major order.

7, 225, 20687, 5115121, 3382058727, 5991606341393, 28434309064956831, 361537376127800203809, 12315682423794584564506503, 1123977764293133379867078361409

Offset

1,1

Comments

Diagonal of A210107.

Links

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

Example

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

Crossrefs

Cf. A210107.

Sequence in context: A138247 A322709 A015506 * A193503 A303533 A372967

Adjacent sequences: A210096 A210097 A210098 * A210100 A210101 A210102

Keyword

nonn

Author

R. H. Hardin, Mar 17 2012

Status

approved