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A200547 Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences 1
14, 76, 280, 1240, 4978, 21626, 91058, 393660, 1686980, 7309386, 31632968, 137600876, 599055566, 2615427970, 11433493630, 50075195034, 219589525108, 964264276780, 4238966033150, 18655002576606, 82175337524524 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A200553

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A200554 A152100 A173962 * A240045 A280396 A010821

Adjacent sequences:  A200544 A200545 A200546 * A200548 A200549 A200550

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 19 2011

STATUS

approved

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Last modified July 3 01:56 EDT 2022. Contains 355029 sequences. (Running on oeis4.)