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A201809
Number of arrays of n integers in -6..6 with sum zero and equal numbers of elements greater than zero and less than zero
1
1, 13, 37, 949, 4501, 99961, 637393, 12004357, 93039589, 1554288913, 13794790153, 211729119889, 2069010499921, 29916152015413, 313278539674477, 4343800080821797, 47825160489621541, 643987273822751329
OFFSET
1,2
COMMENTS
Column 6 of A201811
LINKS
EXAMPLE
Some solutions for n=6
..5....1...-1....0...-1....5...-6....6....2....3....6....3....0....6....2...-4
..6...-3...-4...-5....2....2...-1...-1...-4....5....1...-6....0...-5...-4....4
.-5....5...-3....4...-4...-2...-4....2...-6....2....3...-5....6....2...-5....1
.-3...-3....6....5...-2...-6....5...-4...-1...-4...-4....4...-6...-3....3...-2
.-6....0....1....0....2....6....1...-4....6...-2...-5...-1...-4....4...-2....4
..3....0....1...-4....3...-5....5....1....3...-4...-1....5....4...-4....6...-3
CROSSREFS
Sequence in context: A195540 A262475 A309808 * A129541 A302858 A244185
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 05 2011
STATUS
approved