A205309 Number of n X 7 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.

528, 6427791, 50933680120, 442834241887042, 3775750320744043966, 32325164995795813807941

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Column 7 of A205310.

Sequence in context: A233255 A204684 A205160 * A045788 A339636 A181414

Adjacent sequences: A205306 A205307 A205308 * A205310 A205311 A205312

Keyword

nonn

Author

R. H. Hardin, Jan 25 2012

Status

approved