A183916 Number of nondecreasing arrangements of n numbers in -8..8 with sum zero

1, 9, 41, 177, 649, 2137, 6375, 17575, 45207, 109583, 252117, 553981, 1168261, 2374753, 4669367, 8908546, 16535154, 29927526, 52925886, 91617530, 155484150, 259062316, 424306230, 683919048, 1085984406, 1700352360, 2627337510

Offset

1,2

Comments

Column 8 of A183917

Links

R. H. Hardin, Table of n, a(n) for n = 1..63

Example

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

Crossrefs

Sequence in context: A056243 A083584 A276780 * A199311 A146239 A083085

Adjacent sequences: A183913 A183914 A183915 * A183917 A183918 A183919

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved