A211577 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 or six distinct values for every i,j,k<=n

24, 108, 294, 702, 1560, 3464, 7448, 16498, 35766, 80586, 178192, 410044, 925128, 2169774, 4976710, 11850650, 27515436, 66271404, 155211372, 376977262, 888276502, 2170805230, 5137041172, 12612008268, 29937248660, 73756347602

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..37

Example

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

Crossrefs

Sequence in context: A060334 A271915 A187163 * A101862 A211591 A211585

Adjacent sequences: A211574 A211575 A211576 * A211578 A211579 A211580

Keyword

nonn

Author

R. H. Hardin Apr 16 2012

Status

approved