A200036 Number of -6..6 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero

0, 12, 78, 808, 7104, 72220, 674234, 6674940, 64642466, 635825548

Offset

1,2

Comments

Column 6 of A200038

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=6
..6....3....4...-3....3....1...-3....3...-2....4....2....1...-3....2...-2....5
.-2...-6....2....4...-3...-1...-1...-3....4...-4....6....5....5....3....2...-3
.-1....2...-2...-2...-6....2....6....3...-1...-2....3...-3....1...-2...-1....1
.-2....5...-1....2....3...-1...-1...-2....1....5...-4....1...-5...-3...-3...-1
.-4....2...-4....1....1...-5...-6....2...-4...-1...-1...-5...-2....6....6...-5
..3...-6....1...-2....2....4....5...-3....2...-2...-6....1....4...-6...-2....3

Crossrefs

Sequence in context: A200055 A230520 A030116 * A224775 A258480 A035042

Adjacent sequences: A200033 A200034 A200035 * A200037 A200038 A200039

Keyword

nonn

Author

R. H. Hardin Nov 12 2011

Status

approved