A207534 Number of nX7 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column.

10686, 114190596, 644774919410, 4082668526457918, 25448608922704616996

Offset

1,1

Comments

Column 7 of A207535

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A254237 A207282 A207478 * A238067 A184603 A247854

Adjacent sequences: A207531 A207532 A207533 * A207535 A207536 A207537

Keyword

nonn

Author

R. H. Hardin, Feb 18 2012

Status

approved