A200461 Number of -n..n arrays x(0..8) of 9 elements with zero sum and nonzero first and second differences

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

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

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

Adjacent sequences: A200458 A200459 A200460 * A200462 A200463 A200464

Keyword

nonn

Author

R. H. Hardin Nov 18 2011

Status

approved