A188227 Number of nondecreasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero and not more than two numbers equal.

1, 3, 12, 81, 598, 4859, 41748, 374820, 3475284, 33053399, 320869264, 3167899567, 31721907390, 321494911644, 3292220700520, 34018798556265, 354312456839426, 3716173628641396, 39220841304052510, 416264662788000213

Offset: 1

Author

R. H. Hardin Mar 24 2011

Keywords

• nonn

Comments

Diagonal of A188236

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..22