A188232 Number of nondecreasing arrangements of n numbers in -(n+3)..(n+3) with sum zero and not more than two numbers equal.

1, 6, 24, 121, 598, 3047, 15696, 81981, 432491, 2302608, 12355260, 66761159, 362992938, 1984748322, 10907074884, 60215001180, 333824553431, 1857784353244, 10375296176688, 58131888133855, 326686361277196, 1841007865239913

Offset: 1

Author

R. H. Hardin, Mar 24 2011

Keywords

• nonn

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..28.

Crossrefs

Column 5 of A188236.