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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
0, 14, 114, 1330, 14156, 169170, 1882238, 22017152, 254776338
OFFSET
1,2
COMMENTS
Column 7 of A200038
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 12 2011
STATUS
approved