A200559 Number of -n..n arrays x(0..8) of 9 elements with zero sum and nonzero second differences

778, 91058, 1639804, 13587804, 72366820, 288237528, 936121220, 2613794508, 6492378076, 14694189538, 30833955936, 60757353766, 113535692414, 202761648044, 348183768616, 577776075892, 930286238568, 1458297755836

Offset

1,1

Comments

Row 7 of A200553

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

Some solutions for n=3
.-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3
.-3....1...-3....1....0....1....0....0....0....1...-3....1....1....1....0....1
..3....3...-1....2....2....2....1...-3...-3....0...-1...-1...-2....3...-1....1
..0....3....3....1....0....1...-1....3....2...-3....2...-1....3....2....1....2
..3....0...-2....2...-3...-1....3....1....1....0....3....3....2....0....2....0
..0...-2....3...-3...-3...-2...-2....3...-1....1....0....1...-3....1....2...-3
..2....0....2....2....3....3....2...-1....3....1....1....3...-2...-2...-1....1
.-2....1....0...-1....2...-3....1...-2....2....3....3...-2....3...-3...-2...-2
..0...-3....1...-1....2....2...-1....2...-1....0...-2...-1....1....1....2....3

Crossrefs

Sequence in context: A252529 A008746 A231062 * A231252 A341190 A147547

Adjacent sequences: A200556 A200557 A200558 * A200560 A200561 A200562

Keyword

nonn

Author

R. H. Hardin Nov 19 2011

Status

approved