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A211581 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, two, three, four, five or six distinct values for every i,j,k<=n 1
25, 125, 457, 1353, 3771, 10123, 26785, 70815, 187485, 501357, 1349215, 3674445, 10074585, 27914969, 77778359, 218513889, 616455627, 1749899177, 4982262575, 14249870589, 40844847989, 117464523359, 338353979903, 977015700789 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..33

EXAMPLE

Some solutions for n=5

.-2....1...-1....0....1...-2...-1....0....1....0....1....1....0...-1....0...-2

.-1....0....0...-1....0....1...-1....0....2....1....1...-1...-1....0....1....0

..0....1...-1....1...-2....0...-1....2....1....2....1....1....1...-1....1...-1

.-2....0...-1...-1....0....1....1....0....0....1....1....0....1...-1....0...-2

..0....0...-2...-2....1....0....1....2...-1....1...-1....0....1....0....0...-1

.-1....0...-1....0....2....0...-1....2...-2....1....1...-1....1....0...-2...-2

CROSSREFS

Sequence in context: A062672 A036321 A289337 * A226231 A211595 A066609

Adjacent sequences:  A211578 A211579 A211580 * A211582 A211583 A211584

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 16 2012

STATUS

approved

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Last modified November 15 21:37 EST 2019. Contains 329168 sequences. (Running on oeis4.)