A211730 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 or six distinct values for every i,j,k<=n

48, 238, 714, 1912, 4946, 12870, 33484, 89124, 237726, 649158, 1771052, 4937870, 13708524, 38836608, 109246792, 313321916, 890240494, 2577595902, 7380219014, 21526814774, 62001807654, 181885545056, 526258853768, 1550638116182

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..53

Example

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

Crossrefs

Sequence in context: A211738 A211749 A211758 * A211740 A211750 A211760

Adjacent sequences: A211727 A211728 A211729 * A211731 A211732 A211733

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved