A188119 Number of strictly increasing arrangements of n nonzero numbers in -(n+4)..(n+4) with sum zero.

0, 6, 18, 80, 296, 1154, 4376, 16547, 62222, 233880, 878268, 3297368, 12383528, 46541138, 175070668, 659220634, 2485025556, 9378589340, 35437315784, 134061346668, 507765754320, 1925456658954, 7309793143626, 27782162090527

Offset: 1

Author

R. H. Hardin Mar 21 2011

Keywords

• nonn

Comments

Column 6 of A188122

Examples

			Some solutions for n=7
.-9..-11..-11...-7..-11..-11...-7..-10..-11...-9..-11...-9...-8..-10...-9..-11
.-4...-6...-3...-4...-7..-10...-6...-9...-8...-5...-7...-6...-7...-9...-8...-7
.-1...-5...-2...-3...-6...-6...-1...-8...-4...-3...-6...-5...-5...-6...-4...-1
..1...-1...-1...-2....2....4....2...-2...-3....1...-2...-1...-3....1....2....1
..3....5....1...-1....3....6....3....8....5....2....6....1....6....5....4....3
..4....8....5....6....8....7....4...10...10....6....9....9....7....8....7....7
..6...10...11...11...11...10....5...11...11....8...11...11...10...11....8....8
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27