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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
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 16 2012
STATUS
approved