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A200033 Number of -3..3 arrays x(0..n-1) of n elements with sum zero and with zeroth through n-1st differences all nonzero 0
0, 6, 14, 84, 264, 1450, 5268, 25070, 102854, 460146, 1954930, 8681238, 37537698, 165783402, 725328338, 3201189116 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A200038
LINKS
Table of n, a(n) for n=1..16.
EXAMPLE
Some solutions for n=6
.-2...-2....3....2...-2...-1...-1...-3....2....3...-1...-2....3....2....1...-3
..2...-1...-1...-1....3...-3...-3....3...-2...-2....3...-3...-1....1...-2....3
..3....2....1...-3....2....3....2...-2....2....3...-2...-1...-2...-3....3....2
.-2...-3....2....2...-3....1....1....2...-3...-2....3....2....2....2...-2...-1
..1....3...-2...-2....3...-3....2...-1...-2...-3...-1....3...-3...-3....2....2
.-2....1...-3....2...-3....3...-1....1....3....1...-2....1....1....1...-2...-3
CROSSREFS
Sequence in context: A139257 A056842 A182752 * A219376 A130263 A213681
Adjacent sequences: A200030 A200031 A200032 * A200034 A200035 A200036
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 12 2011
STATUS
approved

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Last modified May 15 14:34 EDT 2024. Contains 372540 sequences. (Running on oeis4.)