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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
OFFSET
1,2
COMMENTS
Column 5 of A199898
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 11 2011
STATUS
approved