A207529 Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row or column

4, 256, 147006, 1066263778, 89061782573052, 87012971830189045874

Offset

1,1

Comments

Diagonal of A207535

Links

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

Example

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

Crossrefs

Sequence in context: A207275 A207473 A223658 * A206968 A206789 A206961

Adjacent sequences: A207526 A207527 A207528 * A207530 A207531 A207532

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved