A211740 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, three, four, six or seven distinct values for every i,j,k<=n

48, 238, 814, 2424, 6888, 19070, 52124, 142276, 386732, 1058996, 2893626, 7993242, 22024912, 61440284, 170755404, 480735696, 1346455548, 3821566724, 10775254120, 30797445968, 87331368670, 251116424714, 715543269216, 2068260652366

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..44

Example

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

Crossrefs

Sequence in context: A211749 A211758 A211730 * A211750 A211760 A333670

Adjacent sequences: A211737 A211738 A211739 * A211741 A211742 A211743

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved