A188207 Number of nondecreasing arrangements of n numbers in -(n+3)..(n+3) with sum zero

1, 6, 25, 126, 649, 3486, 19138, 107233, 610358, 3521260, 20547836, 121095602, 719833595, 4311542748, 25999063108, 157723186593, 962014388419, 5896435229442, 36301479759571, 224396764731302, 1392253538833522

Offset

1,2

Comments

Column 5 of A188211

Links

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

Example

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

Crossrefs

Sequence in context: A153481 A099359 A073967 * A275541 A082430 A136593

Adjacent sequences: A188204 A188205 A188206 * A188208 A188209 A188210

Keyword

nonn

Author

R. H. Hardin Mar 24 2011

Status

approved