A268364 Number of (2n-1) X 3 arrays containing 3 copies of 0..2n-2 with row sums equal.

1, 216, 116640, 535610880, 3614668001280, 89303801403801600, 2951593617355820236800

Offset

1,2

Comments

Column 3 of A268367 (odd terms)

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Cf. A268367.

Sequence in context: A134358 A167127 A269821 * A358657 A048100 A222337

Adjacent sequences: A268361 A268362 A268363 * A268365 A268366 A268367

Keyword

nonn

Author

R. H. Hardin, Feb 03 2016

Status

approved