A200170 Number of -n..n arrays x(0..6) of 7 elements with nonzero sum and with zero through 6 differences all nonzero.

2, 2276, 57992, 631638, 3687480, 15586972, 50917674, 141509152, 344941886, 762917274, 1552478008, 2969607490, 5365606152, 9271467482, 15395275250

Offset: 1

Author

R. H. Hardin Nov 13 2011

Keywords

• nonn

Comments

Row 7 of A200165

Examples

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