A200546 - OEIS

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A200546

Number of -1..1 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences

4, 14, 26, 72, 142, 362, 778, 1938, 4366, 10628, 24532, 59138, 138680, 333014, 788374, 1890870, 4503208, 10803262, 25831504, 62025512, 148725902, 357516682, 859055042, 2067463940, 4975921904, 11988835382, 28892947100, 69685951942

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OFFSET

1,1

COMMENTS

Column 1 of A200553

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A030572 A175680 A094320 * A304342 A066907 A130439

Adjacent sequences: A200543 A200544 A200545 * A200547 A200548 A200549

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 19 2011

STATUS

approved