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

1,2

Comments

Column 5 of A188236

Links

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

Example

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

Crossrefs

Sequence in context: A052557 A357192 A357194 * A274072 A224662 A200160

Adjacent sequences: A188229 A188230 A188231 * A188233 A188234 A188235

Keyword

nonn

Author

R. H. Hardin Mar 24 2011

Status

approved