A056322 Number of primitive (aperiodic) reversible strings with n beads using exactly six different colors.

0, 0, 0, 0, 0, 360, 7560, 95760, 952560, 8217720, 64615680, 476514720, 3355679880, 22837094280, 151449674040, 984573560880, 6302070915840, 39847410373680, 249509384858160, 1550188402338240, 9570844671217200

Offset

1,6

Comments

A string and its reverse are considered to be equivalent.

References

M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]

Links

Table of n, a(n) for n=1..21.

Formula

Sum mu(d)*A056313(n/d) where d|n.

Crossrefs

Cf. A056317, A056313.

Sequence in context: A024185 A033592 A305626 * A056313 A192829 A229681

Adjacent sequences: A056319 A056320 A056321 * A056323 A056324 A056325

Keyword

nonn

Author

Marks R. Nester

Status

approved