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A200190 Number of -6..6 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing 1
1, 12, 66, 426, 2794, 18838, 127800, 881008, 6081086, 42452472, 296258332, 2085263400, 14662923954, 103810065802, 734016517080, 5219300699654, 37060739113354, 264413563521598, 1883784631395118, 13476226807283384 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A200192

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A161805 A003200 A036399 * A270251 A165107 A032167

Adjacent sequences:  A200187 A200188 A200189 * A200191 A200192 A200193

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 14 2011

STATUS

approved

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Last modified December 7 05:39 EST 2016. Contains 278841 sequences.