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A200461
Number of -n..n arrays x(0..8) of 9 elements with zero sum and nonzero first and second differences
1
34, 18692, 548204, 5876818, 36725772, 163058296, 572857272, 1697721154, 4418429664, 10383073842, 22471124198, 45437973772, 86792210440, 157952348940, 275717978586, 464147942094, 756885155284, 1199972729134, 1855294240358
OFFSET
1,1
COMMENTS
Row 7 of A200454
LINKS
EXAMPLE
Some solutions for n=3
..1...-3...-3...-3....0...-3...-3....1....0....1....0....0...-3...-3...-3....0
.-3...-1....0...-1....1....1....0....0...-3....0...-3...-3....1....1....1...-3
..1....3...-1...-2...-3...-2....1...-3....2....2....2....2...-3....2....2....1
.-3...-1....3....3....2....1...-3...-2....1...-2...-2...-3....0....0....0....3
..2....1....0...-2....0....3....1....3....2...-1...-3....1...-1....2...-3...-3
..3....0....2...-1...-3....2....3....2...-1....1....3...-3....2....3...-2....2
.-1....2....3....3....1...-1....0...-3...-2...-1....2....1....3....0....3...-2
.-2....1...-3....0....2...-2...-1....3...-1....1....3....3....1...-2....2...-1
..2...-2...-1....3....0....1....2...-1....2...-1...-2....2....0...-3....0....3
CROSSREFS
Sequence in context: A220870 A281539 A223040 * A287052 A177324 A270874
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 18 2011
STATUS
approved