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A208817
Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.
0
1, 3, 8, 75, 905, 17339, 417204, 12322101, 427919519, 17112239947, 774546254686
OFFSET
1,2
COMMENTS
Diagonal of A208825.
EXAMPLE
All solutions for n=3:
.-2....0...-3...-3...-2...-1...-2...-1
.-1....0....0....1....0...-1....1....0
..3....0....3....2....2....2....1....1
CROSSREFS
Sequence in context: A095051 A362990 A092372 * A356529 A060752 A376941
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved