cp's OEIS Frontend

A209479 Number of n-bead necklaces labeled with numbers -2..2 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

%I A209479 #7 Mar 12 2017 23:32:50
%S A209479 1,3,4,15,38,136,458,1781,6912,28141,115761,485607,2056341,8800541,
%T A209479 37945282,164766522,719617100,3159529303,13936202144
%N A209479 Number of n-bead necklaces labeled with numbers -2..2 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
%C A209479 Column 2 of A209485.
%e A209479 Some solutions for n=10:
%e A209479 .-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2...-2
%e A209479 .-1....0...-2...-2....0...-1...-1...-2...-1...-2...-2...-2...-1....1....0....0
%e A209479 ..1...-1....0....1....0...-1....1....0....2...-1....0...-1...-1...-1...-1....0
%e A209479 .-2...-1....0....2...-2....2...-2...-2....0....2....1....1...-1....0....2....2
%e A209479 .-1....0....2...-1....0....0....2....2...-1....1....1....2....2....0...-2...-1
%e A209479 ..2...-1...-1...-2....2....0....2....1....1...-2....2....2....0....2....2....0
%e A209479 ..0....2....2....1....1....1...-2...-1....1....0....2....2....2...-1....2...-1
%e A209479 ..2....2...-2....2....2....1....0....0....1....2...-2...-1....2....0...-1...-1
%e A209479 ..0....0....2...-1...-2....0....1....2...-2....2...-1...-1...-1...-1...-1....2
%e A209479 ..1....1....1....2....1....0....1....2....1....0....1....0....0....2....1....1
%K A209479 nonn
%O A209479 1,2
%A A209479 _R. H. Hardin_, Mar 09 2012