A265654 Number of nX3 arrays containing 3 copies of 0..n-1 with no equal diagonal or antidiagonal neighbors and new values introduced sequentially from 0.

1, 1, 20, 1129, 104241, 14031233, 2641322440, 663690698065, 214585916901953

Offset

1,3

Comments

Column 3 of A265656.

Links

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

Example

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

Crossrefs

Cf. A265656.

Sequence in context: A210835 A002305 A091535 * A152130 A151625 A203775

Adjacent sequences: A265651 A265652 A265653 * A265655 A265656 A265657

Keyword

nonn

Author

R. H. Hardin, Dec 12 2015

Status

approved