|
Search: id:A056333
|
|
|
| A056333 |
|
Number of primitive (aperiodic) reversible string structures with n beads using a maximum of four different colors. |
|
+0
3
|
|
| 1, 1, 3, 9, 30, 102, 378, 1440, 5607, 22155, 87978, 350775, 1400490, 5597487, 22379145, 89498880, 357952170, 1431737433, 5726775978, 22906819575, 91626580269, 366505186047, 1466017950378, 5864067254880
(list; graph; listen)
|
|
|
OFFSET
|
1,3
|
|
|
COMMENT
|
A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure.
|
|
REFERENCES
|
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
|
|
FORMULA
|
Sum mu(d)*A056323(n/d) where d|n.
|
|
CROSSREFS
|
Cf. A056315.
Sequence in context: A096222 A090573 A048119 this_sequence A047007 A047064 A007453
Adjacent sequences: A056330 A056331 A056332 this_sequence A056334 A056335 A056336
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
|
|
Search completed in 0.002 seconds
|
