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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A200057

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

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 A067250 A061005

Adjacent sequences:  A200051 A200052 A200053 * A200055 A200056 A200057

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 13 2011

STATUS

approved

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Last modified November 30 17:31 EST 2020. Contains 338807 sequences. (Running on oeis4.)