A205160 Number of n X 7 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..3 introduced in row major order.

528, 6427791, 35987024999, 231638725420288, 1458877292453477918, 9223088985799640757493

Offset

1,1

Links

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

Example

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

Crossrefs

Column 7 of A205161.

Sequence in context: A233128 A233255 A204684 * A205309 A045788 A339636

Adjacent sequences: A205157 A205158 A205159 * A205161 A205162 A205163

Keyword

nonn

Author

R. H. Hardin, Jan 22 2012

Status

approved