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A200186 Number of -2..2 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, 4, 6, 14, 24, 54, 104, 230, 464, 1028, 2128, 4720, 9918, 22038, 46760, 104056, 222338, 495358, 1064138, 2373070, 5119796, 11425974, 24738074, 55242788, 119958510, 268018844, 583462384, 1304179214, 2845288284, 6362293924 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A200192

LINKS

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

EXAMPLE

Some solutions for n=5

.-2....0...-2....0...-1....2....2...-2...-1...-1...-2....1....1....2...-1....0

..1....2....2...-2....2...-2...-2....2....2....1....2...-1...-2...-1....2....2

.-1...-2...-1....2...-1....2....0...-2...-1...-1....0....2....1....1...-2...-1

..2....1....2...-2....1...-2...-2....2....2....2....2...-2...-1...-2....2....1

..0...-1...-1....2...-1....0....2....0...-2...-1...-2....0....1....0...-1...-2

CROSSREFS

Sequence in context: A126867 A027632 A175722 * A192782 A306742 A188576

Adjacent sequences:  A200183 A200184 A200185 * A200187 A200188 A200189

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 14 2011

STATUS

approved

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Last modified May 6 09:45 EDT 2021. Contains 343580 sequences. (Running on oeis4.)