A211757 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 four, six, seven or eight distinct values for every i,j,k<=n

36, 154, 576, 2024, 6800, 22568, 73472, 240760, 780588, 2570304, 8389972, 27928068, 92072644, 310034916, 1031933696, 3509571076, 11773984392, 40357220784, 136211521048, 469619503208, 1592083419460, 5512376842976, 18747568314652

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..37

Example

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

Crossrefs

Sequence in context: A211737 A211739 A211748 * A250633 A211759 A064244

Adjacent sequences: A211754 A211755 A211756 * A211758 A211759 A211760

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved