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A200055 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing 1
1, 12, 78, 546, 3914, 28554, 211242, 1577878, 11867186, 89815404, 682642050, 5211283212, 39897460856, 306446600454, 2358644800468, 18199380449274, 140644480480176, 1089068472750998, 8443172123261506, 65564035662489652 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A200057

LINKS

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

EXAMPLE

Some solutions for n=6

.-2....0...-3...-1...-3....5...-2....5....2....1...-3....0....4...-6...-1...-5

..4....5...-5...-2....1...-3....5...-5....1....0....0...-1...-3....3....0....1

.-5...-3....4....1...-6....1...-6....2....5....1...-1....1....1...-4...-2...-6

..4...-2....2...-3....6...-1....5...-2...-6...-3....2...-2...-6....3....5....3

.-5...-4....5....6....0....1...-4....1....1....4...-3....3....6....1...-2....1

..4....4...-3...-1....2...-3....2...-1...-3...-3....5...-1...-2....3....0....6

CROSSREFS

Sequence in context: A227707 A189493 A199492 * A230520 A030116 A200036

Adjacent sequences:  A200052 A200053 A200054 * A200056 A200057 A200058

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 13 2011

STATUS

approved

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Last modified September 18 15:44 EDT 2021. Contains 347527 sequences. (Running on oeis4.)