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A209029 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first differences in -5..5. 1
1, 3, 7, 38, 187, 1237, 8235, 58524, 422504, 3117158, 23290361, 176103500, 1344136056, 10344670554, 80181862705, 625395356182, 4904914026691, 38658468142298, 306034794302017, 2432316965565820, 19401236375176220, 155259190622702818 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=6:

.-4...-3...-2...-3...-3...-3...-3...-3...-3...-3...-3...-3...-2...-2...-2...-3

.-1....0...-1....0...-2....1....0...-2....1...-2...-2...-3....0....1....0...-2

..0....1....0....0....1....2....3....2...-3....2....2...-2....1...-1....1....1

..0....0....3....0....4...-2....0...-1....1....2....1....1....2....1....1....1

..4....2...-1....1...-1....0...-2....2....2....3....0....5...-2....0...-2....3

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

CROSSREFS

Column 5 of A209032.

Sequence in context: A042895 A173561 A258840 * A169741 A282427 A192198

Adjacent sequences:  A209026 A209027 A209028 * A209030 A209031 A209032

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 04 2012

EXTENSIONS

a(15)-a(22) from Andrew Howroyd, Mar 12 2017

STATUS

approved

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Last modified April 22 11:46 EDT 2019. Contains 322330 sequences. (Running on oeis4.)