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A200054
Number of -5..5 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing
1
1, 10, 56, 324, 1948, 11962, 74338, 466548, 2947742, 18746754, 119701782, 767860824, 4938868628, 31876070432, 206122332340, 1336425077996, 8676994345132, 56457974059982, 367738443114696, 2399500033305708
OFFSET
1,2
COMMENTS
Column 5 of A200057
LINKS
EXAMPLE
Some solutions for n=6
.-2...-5....3...-4...-5....0...-4....5...-2....4....0....5...-4...-2...-2....0
.-3....4...-3...-1....4...-3....4...-4...-5...-3....3...-5....0...-3....2....5
..5...-3....4...-5...-1....4...-4....1....2....3...-4....0...-3....2....0....0
.-1....2...-5....4....5...-4....3...-5...-3....0...-1...-3....2....0....4....1
..5....0....3....2...-2....5...-4....4....5....1...-3....2....1....3...-3...-5
.-4....2...-2....4...-1...-2....5...-1....3...-5....5....1....4....0...-1...-1
CROSSREFS
Sequence in context: A087076 A014483 A116971 * A034195 A351458 A067250
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 13 2011
STATUS
approved