A211580 Number of -2..2 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, five or six distinct values for every i,j,k<=n

24, 116, 396, 1108, 2954, 7640, 19676, 51060, 133728, 356546, 961630, 2639484, 7312996, 20540736, 58061306, 165704028, 474754182, 1368989652, 3956576274, 11483585258, 33373408392, 97258918906, 283647632398, 828748613072

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..35

Example

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

Crossrefs

Sequence in context: A228433 A124952 A126411 * A211594 A211465 A371184

Adjacent sequences: A211577 A211578 A211579 * A211581 A211582 A211583

Keyword

nonn

Author

R. H. Hardin Apr 16 2012

Status

approved