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A056322
Number of primitive (aperiodic) reversible strings with n beads using exactly six different colors.
2
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]
FORMULA
Sum mu(d)*A056313(n/d) where d|n.
CROSSREFS
Sequence in context: A024185 A033592 A305626 * A056313 A192829 A229681
KEYWORD
nonn
STATUS
approved