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A200056 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and elements alternately strictly increasing and strictly decreasing 1
1, 14, 106, 850, 7074, 59910, 514168, 4453946, 38855488, 341052122, 3006680636, 26619825378, 236386648574, 2105717447626, 18798362729604, 168222072625668, 1507848061916274, 13541292792666004, 121763260320351938 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A200057

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..189

EXAMPLE

Some solutions for n=6

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

..5...-4....3....4...-6....5....4...-4....2....6...-1...-1...-4....7...-3....2

.-2...-1....2...-6....4...-5...-5...-1...-3...-4....1...-5....7...-7....7...-3

..7...-5....5....1...-1....0....0...-2....3....4...-7....5...-5....0...-3....5

.-7....6...-7....0....6...-3...-3....5...-4...-7....4....0....5...-1....0...-7

.-4....1...-4....7....2...-1....5....0....3....6...-3....4...-3....7...-7....2

CROSSREFS

Sequence in context: A190868 A125351 A126509 * A206754 A099300 A038735

Adjacent sequences:  A200053 A200054 A200055 * A200057 A200058 A200059

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.)