A200558 Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences

362, 21626, 266812, 1689732, 7286542, 24378976, 68263780, 167521092, 371147726, 758120242, 1449515972, 2623194882, 4532144132, 7526204850, 12076969112, 18807807576, 28527996642, 42270457652, 61336410730, 87344689150

Offset

1,1

Comments

Row 6 of A200553

Links

R. H. Hardin, Table of n, a(n) for n = 1..58

Example

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

Crossrefs

Sequence in context: A155019 A020539 A157442 * A212324 A007565 A098253

Adjacent sequences: A200555 A200556 A200557 * A200559 A200560 A200561

Keyword

nonn

Author

R. H. Hardin Nov 19 2011

Status

approved