A188180 Number of strictly increasing arrangements of n numbers in -(n+6)..(n+6) with sum zero

1, 8, 41, 207, 967, 4370, 19138, 81805, 343363, 1421530, 5820904, 23626234, 95220378, 381577586, 1521967986, 6047272980, 23951790860, 94618944122, 372969633775, 1467518524851, 5765549295661, 22623246705372, 88678543148354

Offset

1,2

Comments

Column 8 of A188181

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for n=5
.-5...-7...-6...-9..-11...-8...-9...-8...-9..-10...-6..-10...-6...-8...-6...-8
.-2...-6...-3...-5...-3...-7...-2...-7...-6...-7...-5...-4...-4...-7...-1...-1
.-1...-3....1....0...-1....4....2...-2...-5....0...-2....2...-2....0....0....0
..3....5....3....6....7....5....3....7....9....6....3....4....4....4....1....1
..5...11....5....8....8....6....6...10...11...11...10....8....8...11....6....8

Crossrefs

Sequence in context: A273176 A080840 A199846 * A026968 A026978 A037577

Adjacent sequences: A188177 A188178 A188179 * A188181 A188182 A188183

Keyword

nonn

Author

R. H. Hardin Mar 23 2011

Status

approved