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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
1
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
OFFSET
1,1
COMMENTS
Column 1 of A200553
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 19 2011
STATUS
approved