A210053 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order

9, 646, 249327, 438056462, 3291534980629, 103709585657221609, 13640392041491409426441, 7487856028633349140449328134

Offset

1,1

Comments

Diagonal of A210061

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..0..0..0..1..1....0..0..0..0..1....0..1..0..0..0....0..0..0..0..1
..0..2..0..1..0....2..2..0..0..0....0..0..0..2..2....2..0..3..0..0
..3..1..3..2..3....1..1..3..3..0....3..3..3..1..1....2..2..1..2..2
..2..0..2..2..2....2..2..0..3..0....1..1..3..1..1....3..2..1..1..2
..0..2..0..2..3....1..1..3..3..3....0..0..2..0..1....1..0..3..1..2

Crossrefs

Sequence in context: A157597 A211611 A280904 * A128795 A323425 A191510

Adjacent sequences: A210050 A210051 A210052 * A210054 A210055 A210056

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved