A210135 Number of (n+1)X(n+1) 0..3 arrays containing all values 0..3 with every 2X2 subblock having one, two or four distinct values, and new values 0..3 introduced in row major order

1, 221, 159327, 363492269, 3047709295897, 100540191960863826, 13475932703981552094893, 7453689884209460671972584992

Offset

1,2

Comments

Diagonal of A210143

Links

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

Example

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

Crossrefs

Sequence in context: A220723 A011816 A048902 * A013548 A300517 A083958

Adjacent sequences: A210132 A210133 A210134 * A210136 A210137 A210138

Keyword

nonn

Author

R. H. Hardin Mar 17 2012

Status

approved