A266571 Number of nX3 arrays containing 3 copies of 0..n-1 with no element 1 greater than its northwest or southwest neighbor modulo n and the upper left element equal to 0.

1, 1, 15, 2320, 729874, 466056593, 515679132204, 897699718056452

Offset

1,3

Comments

Column 3 of A266572.

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Cf. A266572.

Sequence in context: A222881 A229844 A208171 * A308389 A278410 A211902

Adjacent sequences: A266568 A266569 A266570 * A266572 A266573 A266574

Keyword

nonn

Author

R. H. Hardin, Jan 01 2016

Status

approved