A211747 Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having one, two, three, four, five, six or seven distinct values for every i,j,k<=n

49, 343, 1869, 8659, 35643, 136121, 494477, 1736395, 5955985, 20088311, 66948523, 221182827, 726211221, 2373978133, 7736949745, 25168197671, 81775419193

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

Some solutions for n=5
.-1....3...-3...-1....0....2...-3....0...-1...-3...-1....1....3....1....2...-2
.-2...-1....0...-2....1...-2...-1....3....2....0...-1...-1...-1...-3....2....1
.-3....3...-3....1....0....1....3...-3....1...-2...-1...-3....3....3...-1....3
..3....1...-1...-2....3...-1....0...-1....0....0....3....3...-1....0....1....1
..1...-2....2....2...-3....3...-1....0....0...-3...-2....1....1....3...-3...-2
..3...-1...-1...-1...-2...-2...-3...-1...-2....1....2....0....1....0....1....0

Crossrefs

Sequence in context: A036322 A036324 A211736 * A211756 A036323 A066429

Adjacent sequences: A211744 A211745 A211746 * A211748 A211749 A211750

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved