A211587 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 one, three, four, five, six or seven distinct values for every i,j,k<=n

17, 61, 213, 705, 2293, 7235, 22491, 68737, 207725, 621607, 1846229, 5452449, 16029207, 46976949, 137331695, 400884837, 1168925307, 3406992747, 9928127547, 28937875373, 84376984733, 246182651755, 718778819599, 2100421491357

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

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

Crossrefs

Sequence in context: A142299 A211579 A211593 * A362069 A226026 A195025

Adjacent sequences: A211584 A211585 A211586 * A211588 A211589 A211590

Keyword

nonn

Author

R. H. Hardin Apr 16 2012

Status

approved