The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A209068 Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2. 0

%I

%S 1,4,12,57,276,1465,8008,45408,263168,1554582,9318412,56549840,

%T 346717662,2144555617,13365472929,83848948043,529091046781,

%U 3355802952070

%N Number of n-bead necklaces labeled with numbers -3..3 not allowing reversal, with sum zero and avoiding the pattern z z+1 z+2.

%C Column 3 of A209073.

%e Some solutions for n=6:

%e .-2...-2...-2...-3...-2...-2...-3...-3...-2...-2...-3...-2...-2...-3...-3...-3

%e ..0...-1....1....2....2....2....3...-1...-2....2....1....3...-1...-3....1....3

%e ..1....3....2....1...-1....0....1....0....3....0....3....1....1....3....1....2

%e .-1....0...-1...-2....3....1....3....3...-1...-2...-1...-1....2....2....0....0

%e ..3...-1....0....3...-1....0...-2...-1....0....3....1....0....1....3...-1...-1

%e .-1....1....0...-1...-1...-1...-2....2....2...-1...-1...-1...-1...-2....2...-1

%Y Cf. A209073.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 04 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 17 11:14 EDT 2022. Contains 353745 sequences. (Running on oeis4.)