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A200448 Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences 1
10, 44, 144, 486, 1582, 5478, 18692, 64782, 223272, 776430, 2701660, 9439702, 33021250, 115801892, 406698282, 1430840312, 5040451088, 17779563894, 62784860258, 221948186878, 785340477204, 2781302241584, 9857972484436 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A200454

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A058310 A005720 A060326 * A124852 A220923 A220994

Adjacent sequences:  A200445 A200446 A200447 * A200449 A200450 A200451

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 18 2011

STATUS

approved

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Last modified April 7 10:00 EDT 2020. Contains 333300 sequences. (Running on oeis4.)