A200037 Number of -7..7 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero

0, 14, 114, 1330, 14156, 169170, 1882238, 22017152, 254776338

Offset

1,2

Comments

Column 7 of A200038

Links

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

Example

Some solutions for n=6
..3...-7...-7...-3....4...-4...-4...-3....1...-7...-5...-3....3....4...-7....1
.-4....1....7....2....3...-5....3....2...-5....4....7....2...-6....3....7....7
.-5...-1...-3....1...-7....6...-2....3....4....5....5...-5....2...-5...-1...-1
..5...-2....3...-5...-3....2....4...-4...-6....4...-4....2...-2....2...-6....4
..6....5....5...-1....2....5....5...-1...-1...-4....4....1....1...-6....6...-7
.-5....4...-5....6....1...-4...-6....3....7...-2...-7....3....2....2....1...-4

Crossrefs

Sequence in context: A071573 A076429 A027204 * A026959 A026989 A204240

Adjacent sequences: A200034 A200035 A200036 * A200038 A200039 A200040

Keyword

nonn

Author

R. H. Hardin Nov 12 2011

Status

approved