A188121 Number of strictly increasing arrangements of n nonzero numbers in -(n+6)..(n+6) with sum zero

0, 8, 32, 167, 740, 3278, 13994, 58595, 241250, 982016, 3959736, 15848648, 63063260, 249773862, 985585668, 3877333900, 15216566840, 59600223620, 233072224782, 910286934007, 3551576307448, 13845532229952, 53940983618522

Offset

1,2

Comments

Column 8 of A188122

Links

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

Example

Some solutions for n=6
-12..-10..-10..-10..-12..-10..-10..-10..-10..-11...-5..-11..-12...-9..-12...-9
.-7...-6...-7...-6...-7...-7...-3...-8...-6...-7...-4..-10..-10...-8..-10...-5
.-1...-3...-2...-3....1...-3...-1...-1...-5...-4...-2...-7...-3...-6....2....1
..2....4....1...-2....3....3....1....4....5....3....2....7....2....1....3....2
..7....5....8....9....4....8....3....6....7....7....3...10...11...10....7....3
.11...10...10...12...11....9...10....9....9...12....6...11...12...12...10....8

Crossrefs

Sequence in context: A334693 A336492 A200153 * A045684 A045675 A086348

Adjacent sequences: A188118 A188119 A188120 * A188122 A188123 A188124

Keyword

nonn

Author

R. H. Hardin Mar 21 2011

Status

approved