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A201810
Number of arrays of n integers in -7..7 with sum zero and equal numbers of elements greater than zero and less than zero
1
1, 15, 43, 1471, 7071, 207621, 1355145, 33222463, 266948431, 5714583505, 53305896645, 1032485634181, 10748736159253, 193347106894215, 2184638624782083, 37202261536824063, 447056372628222463
OFFSET
1,2
COMMENTS
Column 7 of A201811
LINKS
EXAMPLE
Some solutions for n=5
.-5....2...-3...-5...-3....2....4....1...-7....6....0....3....4....0...-2...-6
..1....3....0....5....2...-3....6...-4....0...-3....1...-4....0....7...-5....3
..0....0...-5...-4....6...-3....0....0....7....3...-2....0....6....1....3....0
.-3...-4....5....4...-5....4...-4...-4....2...-6...-1....2...-7...-1....4....5
..7...-1....3....0....0....0...-6....7...-2....0....2...-1...-3...-7....0...-2
CROSSREFS
Sequence in context: A193647 A133343 A027845 * A364081 A292018 A289669
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 05 2011
STATUS
approved