A200159 Number of -2..2 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero

4, 8, 34, 76, 276, 700, 2276, 5992, 18542, 50488, 151814, 420680, 1241580, 3481308, 10162686, 28707288, 83211126, 236138900, 681383716, 1939299184, 5579324890, 15908310224, 45678520824, 130391096068

Offset

1,1

Comments

Column 2 of A200165

Links

Table of n, a(n) for n=1..24.

Example

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

Crossrefs

Sequence in context: A149102 A149103 A039303 * A149104 A149105 A149106

Adjacent sequences: A200156 A200157 A200158 * A200160 A200161 A200162

Keyword

nonn

Author

R. H. Hardin Nov 13 2011

Status

approved