A211760 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, seven or eight distinct values for every i,j,k<=n

48, 238, 1090, 4700, 19416, 77230, 298248, 1126116, 4173244, 15284832, 55380108, 199716434, 716243222, 2568023112, 9186764004, 32942074532, 118090246196, 424908897976, 1530052452794, 5533187012184, 20034395018116

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Example

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

Crossrefs

Sequence in context: A211730 A211740 A211750 * A333670 A230136 A157913

Adjacent sequences: A211757 A211758 A211759 * A211761 A211762 A211763

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved