A211738 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 seven distinct values for every i,j,k<=n.

48, 230, 690, 1896, 4914, 12834, 33110, 87532, 231044, 626294, 1696208, 4710442, 13035934, 36914622, 103843336, 298400536, 849446000, 2467182708, 7083241528, 20732756786, 59887058198, 176273740060, 511404834472, 1511408416446

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A269014 A265422 A211729 * A211749 A211758 A211730

Adjacent sequences: A211735 A211736 A211737 * A211739 A211740 A211741

Keyword

nonn

Author

R. H. Hardin, Apr 20 2012

Status

approved