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A208806
Number of n-bead necklaces labeled with numbers -n..n not allowing reversal, with sum zero and three times sum of squares <= n^2*(n+1).
0
1, 2, 7, 82, 1093, 20409, 486633, 14395011, 494288725, 19525179009
OFFSET
1,2
COMMENTS
Diagonal of A208814.
EXAMPLE
Some solutions for n=6:
.-3...-4...-3...-5...-3...-4...-5...-4...-5...-5...-5...-4...-3...-4...-6...-5
..5....3...-2....1....4....1....4....1...-1....1....0....1....0....0....3....1
.-2...-1....5...-1...-2...-3....2....1....5...-4....3...-2...-3....6...-1....4
..2....1...-3...-3....3....5....0...-2....4....5...-2....3....0....0....1....2
.-2...-2...-2....2...-1...-2...-2...-2....0....2...-2...-4....0....0....4...-2
..0....3....5....6...-1....3....1....6...-3....1....6....6....6...-2...-1....0
CROSSREFS
Sequence in context: A232041 A135756 A263368 * A319144 A111822 A062764
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 01 2012
STATUS
approved