|
Search: id:A056341
|
|
|
| A056341 |
|
Number of bracelets using a maximum of six different colored beads. |
|
+0
3
|
|
| 6, 21, 56, 231, 888, 4291, 20646, 107331, 563786, 3037314, 16514106, 90782986, 502474356, 2799220041, 15673673176, 88162676511, 497847963696, 2821127825971, 16035812864946, 91404068329560
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Turning over will not create a new bracelet.
|
|
REFERENCES
|
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
|
|
FORMULA
|
a(n) = sum phi(d)*6^(n/d)/2/n where d|n and a(n)=6^((n+1)/2)/2 for n odd and a(n)=7/4*6^(n/2) for n even.
|
|
CROSSREFS
|
Cf. A000029, A054625.
Sequence in context: A058484 A074745 A056414 this_sequence A053809 A047520 A066524
Adjacent sequences: A056338 A056339 A056340 this_sequence A056342 A056343 A056344
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
|
|
|
Search completed in 0.002 seconds
|
