A208967 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first and second differences in -5..5.

1, 2, 2, 11, 40, 221, 1185, 6883, 39143, 224991, 1299553, 7598452, 44893012, 267934513

Offset

1,2

Comments

Column 5 of A208970.

Links

Table of n, a(n) for n=1..14.

Example

Some solutions for n=5:
.-1...-2...-1...-2...-1...-2...-1...-3...-2...-2...-3....0...-2...-2...-2...-3
..0...-1...-1....0...-1...-2...-1...-1....0....0...-2....0...-1...-2...-1...-2
.-1....2....0....2....1...-2....0....2....0....1....1....0...-1....1....1....2
..1....1....2...-1....0....3....0....2....2....1....3....0....2....1....2....2
..1....0....0....1....1....3....2....0....0....0....1....0....2....2....0....1

Crossrefs

Sequence in context: A090527 A014220 A089544 * A192824 A184237 A069648

Adjacent sequences: A208964 A208965 A208966 * A208968 A208969 A208970

Keyword

nonn

Author

R. H. Hardin, Mar 03 2012

Status

approved