A200034 Number of -4..4 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero

0, 8, 28, 218, 1074, 7384, 41228, 262004, 1565836, 9730070, 59336930, 368674288

Offset

1,2

Comments

Column 4 of A200038

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A058289 A152014 A316512 * A230702 A374280 A244613

Adjacent sequences: A200031 A200032 A200033 * A200035 A200036 A200037

Keyword

nonn

Author

R. H. Hardin Nov 12 2011

Status

approved