cp's OEIS Frontend

A209484 Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

%I A209484 #6 Mar 12 2017 23:29:07
%S A209484 1,8,31,311,3014,34233,401634,4907310,61316012,780896062,10092511209
%N A209484 Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
%C A209484 Column 7 of A209485.
%e A209484 Some solutions for n=6:
%e A209484 .-7...-6...-7...-7...-5...-7...-5...-5...-5...-7...-6...-7...-6...-5...-6...-4
%e A209484 ..1....1...-3...-1...-5...-4....0...-3...-3...-1....0...-1...-5...-2....1...-2
%e A209484 ..7....4....4...-4....5....4....2....0...-1....5....3...-3...-2...-1....1...-1
%e A209484 .-7....3....0....4...-1....6...-4....0....2...-5...-5....3....1....6...-5...-4
%e A209484 ..2...-5....5....1....1....0....1....7....2....7....5....4....7...-2....6....7
%e A209484 ..4....3....1....7....5....1....6....1....5....1....3....4....5....4....3....4
%K A209484 nonn
%O A209484 1,2
%A A209484 _R. H. Hardin_, Mar 09 2012