|
%I #6 Mar 12 2017 23:53:42
%S 1,7,41,362,3325,32802,336055,3552027,38413793,423087907,4729090301,
%T 53509230007
%N Number of n-bead necklaces labeled with numbers -6..6 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
%C Column 6 of A209115.
%e Some solutions for n=6:
%e .-3...-3...-3...-5...-5...-6...-6...-4...-5...-3...-5...-6...-2...-6...-3...-4
%e ..3....1...-2....3....2...-3...-6....5....6...-2....2....1...-1...-2....1...-1
%e .-1...-2....2....4....2....2....5...-1...-1....2....2....0...-1....5....5....4
%e .-3....0....5....3...-2....6....1...-3...-1....5....3...-2...-1....3...-1....4
%e ..6....6...-3...-3...-1....1....4....1...-2...-1....1....6....5...-1...-1...-2
%e .-2...-2....1...-2....4....0....2....2....3...-1...-3....1....0....1...-1...-1
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 05 2012
| 