A200209 Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second and third differences.

192, 16092, 217946, 1453304, 6428538, 21939870, 62361448, 154585536, 345422978, 710643132, 1366075526, 2483991350, 4309599382, 7180688000, 11557570298, 18048274072, 27438624488, 40742003838, 59232871060, 84489363024

Offset

1,1

Comments

Row 5 of A200204

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

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

Crossrefs

Sequence in context: A282208 A154308 A187460 * A205760 A338532 A035833

Adjacent sequences: A200206 A200207 A200208 * A200210 A200211 A200212

Keyword

nonn

Author

R. H. Hardin, Nov 14 2011

Status

approved