A188206 Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero.

1, 5, 18, 86, 414, 2137, 11322, 61731, 343363, 1943488, 11157558, 64841876, 380777798, 2256500525, 13479035412, 81085573679, 490856939495, 2988208167015, 18283978901128, 112390059830932, 693750864437218, 4298745830972544

Offset: 1

Author

R. H. Hardin Mar 24 2011

Keywords

• nonn

Comments

Column 4 of A188211

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..29