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A188328
Number of nondecreasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero
1
0, 4, 12, 61, 288, 1488, 7836, 42593, 236130, 1333130, 7636298, 44294040, 259682196, 1536666930, 9167492664, 55086510571, 333133752902, 2026193778596, 12387543671686, 76088580071361, 469354099705916, 2906492292139022
OFFSET
1,2
COMMENTS
Column 4 of A188333
LINKS
EXAMPLE
Some solutions for n=6
.-8...-8...-8...-6...-5...-7...-4...-7...-5...-7...-8...-5...-4...-3...-5...-6
.-8...-5...-7...-4...-4...-7...-3...-5...-5...-4...-6...-2...-4...-2...-5...-6
.-2...-5...-1...-4...-4....1...-1...-5...-4...-3...-2....1...-3...-2...-5...-4
..3....5....4....2...-1....1...-1....4....1....4....3....1....1...-2....4....4
..7....5....4....4....7....5....1....6....5....4....5....1....5....4....4....4
..8....8....8....8....7....7....8....7....8....6....8....4....5....5....7....8
CROSSREFS
Sequence in context: A083484 A088860 A097250 * A291772 A222645 A259816
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 28 2011
STATUS
approved