A188174 Number of strictly increasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero.

1, 2, 8, 43, 252, 1636, 11322, 81805, 610358, 4672836, 36525052, 290399543, 2342043630, 19118822650, 157709971144, 1312796873451, 11015236989702, 93078467831012, 791462018168032, 6767910089071288, 58167781282121262

Offset: 1

Author

R. H. Hardin Mar 23 2011

Keywords

• nonn

Comments

Diagonal of A188181

Examples

			Some solutions for n=5
.-8...-7...-4...-6...-6...-7...-8...-8...-5...-5...-7...-6...-5...-7...-4...-7
.-6...-4...-2...-5...-5...-2...-1...-3...-2...-2...-5...-4...-3...-3...-3...-4
.-1....1....0...-3....1....1....0...-1...-1...-1....0...-1...-1....2...-1....1
..7....4....2....6....3....3....1....5....0....1....4....3....3....3....3....2
..8....6....4....8....7....5....8....7....8....7....8....8....6....5....5....8
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..32