A188204 Number of nondecreasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero.

1, 3, 13, 86, 649, 5444, 48417, 450096, 4323349, 42611589, 428774562, 4388708804, 45566531999, 478878888344, 5085572069608, 54500021186920, 588726212033973, 6404580593674139, 70112392484932177, 771869051769933762

Offset: 1

Author

R. H. Hardin Mar 24 2011

Keywords

• nonn

Comments

Diagonal of A188211

Examples

			All solutions for n=3
.-2....0...-2...-3...-1...-3...-4...-2...-4...-4...-3...-2...-1
..0....0...-2...-1....0....0....0....1....1....2....1...-1...-1
..2....0....4....4....1....3....4....1....3....2....2....3....2
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..24