|
%I #6 Mar 12 2017 23:54:49
%S 1,5,19,120,741,5032,35253,255821,1898309,14350653,110094949,
%T 855048115,6709326541,53110380781
%N Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
%C Column 4 of A209115.
%e Some solutions for n=6:
%e .-4...-3...-4...-4...-4...-4...-3...-3...-4...-3...-3...-4...-3...-4...-4...-4
%e .-1....0...-3....2....3....0....3...-3....0...-1...-1....3....3...-4....0....1
%e ..2....1...-3...-3....2....4...-2....3....3...-3....0....4...-3....3....4....2
%e ..3....0....4....4...-3...-1....2....2....3....4...-2...-3....4....4...-2....0
%e ..3....2....2....4....2...-2....1...-1....1....1....3....1....1....0...-2....4
%e .-3....0....4...-3....0....3...-1....2...-3....2....3...-1...-2....1....4...-3
%K nonn
%O 1,2
%A _R. H. Hardin_, Mar 05 2012
| 