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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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 03:59 EST 2021. Contains 349530 sequences. (Running on oeis4.)