A188210 Number of nondecreasing arrangements of n numbers in -(n+6)..(n+6) with sum zero.

1, 9, 50, 318, 1944, 11963, 73316, 450096, 2767118, 17052653, 105356398, 652694106, 4054512228, 25254176312, 157709971144, 987358943331, 6196330627807, 38975339759358, 245693231541360, 1552021349807456, 9823321416340666

Offset: 1

Author

R. H. Hardin Mar 24 2011

Keywords

• nonn

Comments

Column 8 of A188211

Examples

			Some solutions for n=3
.-3...-7...-4...-5...-2...-4...-5...-9...-8...-9...-6...-3...-4...-7...-3...-6
.-3....0...-3...-2...-2....1...-4....2....1....3....2...-1...-1....1....1....1
..6....7....7....7....4....3....9....7....7....6....4....4....5....6....2....5
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..25