cp's OEIS Frontend

A209341 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero with no three beads in a row equal.

%I A209341 #6 Mar 12 2017 23:37:08
%S A209341 1,6,17,128,883,7358,62853,563109,5153746,48127107,456011561,
%T A209341 4374662802,42398844001
%N A209341 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero with no three beads in a row equal.
%C A209341 Column 5 of A209344.
%e A209341 Some solutions for n=7:
%e A209341 .-4...-5...-5...-5...-3...-3...-5...-4...-3...-5...-3...-4...-4...-5...-4...-3
%e A209341 .-3....1...-4....2...-2....0....0...-1....1....3...-1...-1...-2...-2...-2...-2
%e A209341 ..1....3....0....2....0....3...-3....2....2....0....5....5....1....1....5....0
%e A209341 ..4....1....5...-3....2...-1....5....0...-2...-2...-2...-3....2....0...-4....5
%e A209341 .-3...-2....4...-2....0...-1....4....2...-2...-2....1...-3....0....5....0...-3
%e A209341 ..4...-1...-1....2....0...-2...-5...-1....0....2...-2....1...-1...-3....1....3
%e A209341 ..1....3....1....4....3....4....4....2....4....4....2....5....4....4....4....0
%K A209341 nonn
%O A209341 1,2
%A A209341 _R. H. Hardin_, Mar 06 2012