|
| |
|
|
A056317
|
|
Number of primitive (aperiodic) reversible strings with n beads using a maximum of six different colors.
|
|
2
| |
|
|
6, 15, 120, 645, 3990, 23295, 140610, 839790, 5042610, 30232965, 181421850, 1088390415, 6530486970, 39182081385, 235093327980, 1410554953080, 8463334761210, 50779978307010, 304679900238330
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
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.
|
|
|
FORMULA
| sum mu(d)*A056308(n/d) where d|n.
|
|
|
CROSSREFS
| Cf. A045625.
Sequence in context: A013228 A133472 A087137 * A129421 A013227 A013223
Adjacent sequences: A056314 A056315 A056316 * A056318 A056319 A056320
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
| |
|
|
