A211585 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, four, five, six or seven distinct values for every i,j,k<=n

24, 108, 350, 962, 2458, 5996, 14108, 32866, 74604, 170544, 381234, 866296, 1927712, 4384998, 9772806, 22344402, 50050666, 115292422, 260040134, 604224496, 1373323994, 3220149132, 7375767952, 17449609076, 40261731480, 96052427846

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A211577 A101862 A211591 * A211599 A282211 A103473

Adjacent sequences: A211582 A211583 A211584 * A211586 A211587 A211588

Keyword

nonn

Author

R. H. Hardin Apr 16 2012

Status

approved