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A199895 Number of -5..5 arrays x(0..n-1) of n elements with zero sum, and adjacent elements not both strictly positive and not both strictly negative 1
1, 11, 51, 351, 2031, 13363, 82555, 536967, 3409609, 22163661, 142744843, 930121865, 6040974735, 39482258363, 257848379869, 1690142722447, 11081263427471, 72823380368573, 478876538926483, 3154101346620987 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A199898

LINKS

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

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A168214 A321421 A317021 * A304280 A231386 A191099

Adjacent sequences:  A199892 A199893 A199894 * A199896 A199897 A199898

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified December 15 22:02 EST 2019. Contains 330012 sequences. (Running on oeis4.)