A211761 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 one, two, three, four, six, seven or eight distinct values for every i,j,k<=n

49, 239, 1091, 4701, 19429, 77363, 299181, 1131389, 4199109, 15400453, 55862597, 201630759, 723544713, 2595026445, 9284175047, 33286441441, 119287476753, 429013756705, 1543962886085, 5579862221185, 20189693737355, 73367588542073

Offset

1,1

Links

Table of n, a(n) for n=1..22.

Example

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

Crossrefs

Sequence in context: A264538 A266799 A211741 * A373707 A373680 A322675

Adjacent sequences: A211758 A211759 A211760 * A211762 A211763 A211764

Keyword

nonn

Author

R. H. Hardin Apr 20 2012

Status

approved