A205308 Number of n X 6 0..3 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order.

143, 447343, 996536552, 2404472055439, 5705396521337690, 13585407518869992739, 32325164995795813807941, 76926439840751174108312233, 183061289081893168962560628406

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=5
..0..0..1..2..3..3....0..0..1..0..0..1....0..0..1..0..0..2....0..0..1..2..0..2
..2..3..0..0..1..2....1..2..1..0..1..3....1..3..2..2..3..2....2..1..1..0..1..1
..3..2..2..0..2..1....1..3..3..1..1..3....3..2..2..3..1..1....2..2..3..0..0..3
..0..1..2..1..3..2....0..1..0..0..2..0....2..1..1..2..1..3....0..0..1..1..2..3
..1..3..0..3..1..0....0..1..1..3..3..0....2..3..1..0..0..1....3..3..2..0..0..2

Crossrefs

Column 6 of A205310.

Sequence in context: A208680 A204683 A205159 * A147553 A030122 A057404

Adjacent sequences: A205305 A205306 A205307 * A205309 A205310 A205311

Keyword

nonn

Author

R. H. Hardin, Jan 25 2012

Status

approved