cp's OEIS Frontend

A209483 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

%I A209483 #6 Mar 12 2017 23:29:37
%S A209483 1,7,24,205,1702,16660,168453,1778878,19211780,211576925,2364602172,
%T A209483 26755001917
%N A209483 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.
%C A209483 Column 6 of A209485.
%e A209483 Some solutions for n=6:
%e A209483 .-6...-4...-4...-4...-4...-5...-3...-5...-5...-5...-5...-6...-2...-2...-2...-6
%e A209483 .-3...-1...-4...-1...-1....0...-2....1...-3...-4....0...-1...-1....0...-2...-4
%e A209483 .-3....3....0....5....1....3...-3...-2...-2....0...-1...-3....1....0....3....3
%e A209483 ..1....2...-1...-3...-1...-4...-1...-1...-2....6....5....1....1...-1...-2...-4
%e A209483 ..5...-4....6...-2....3....1....4....4....6....4...-1....3...-1...-1...-2....6
%e A209483 ..6....4....3....5....2....5....5....3....6...-1....2....6....2....4....5....5
%K A209483 nonn
%O A209483 1,2
%A A209483 _R. H. Hardin_, Mar 09 2012