A211749 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 two, four, six or eight distinct values for every i,j,k<=n

48, 230, 950, 3632, 13422, 48542, 173584, 620100, 2210560, 7933738, 28500322, 103284630, 374776104, 1371409876, 5022197054, 18526229324, 68352157746, 253717012028, 941511432258, 3511229532198, 13087482838170, 48979882211566

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..52

Example

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

Crossrefs

Sequence in context: A265422 A211729 A211738 * A211758 A211730 A211740

Adjacent sequences: A211746 A211747 A211748 * A211750 A211751 A211752

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved