A200161 Number of -4..4 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero

8, 48, 348, 2256, 15040, 96884, 631638, 4072228, 26327538, 169703920, 1094685786, 7052320656

Offset

1,1

Comments

Column 4 of A200165

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5
..2...-1....1....1....2....3....3...-2....3....3....1....3....3...-2....4...-2
..3...-2...-2....4...-2....2...-4....1...-1....4...-2....4...-3....3....2...-4
.-1....3...-4...-2...-1...-3...-1...-3....2...-1...-1...-3....4....1....4...-1
..2...-2....4...-1...-4....2....3....4....3....4...-4...-2...-3....4...-2...-3
.-2...-4...-4....3...-3....3....2...-3...-3....2...-1....3...-2....1...-3....2

Crossrefs

Sequence in context: A220251 A025013 A215706 * A172111 A144014 A131681

Adjacent sequences: A200158 A200159 A200160 * A200162 A200163 A200164

Keyword

nonn

Author

R. H. Hardin Nov 13 2011

Status

approved