login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A056317 Number of primitive (aperiodic) reversible strings with n beads using a maximum of six different colors. 3
6, 15, 120, 645, 3990, 23295, 140610, 839790, 5042610, 30232965, 181421850, 1088390415, 6530486970, 39182081385, 235093327980, 1410554953080, 8463334761210, 50779978307010, 304679900238330 (list; graph; refs; listen; history; text; 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. [See A056391 for pdf file of Chap. 2]

LINKS

Table of n, a(n) for n=1..19.

FORMULA

sum mu(d)*A056308(n/d) where d|n.

CROSSREFS

Column 6 of A284871.

Cf. A045625.

Sequence in context: A213873 A219771 A087137 * A129421 A013227 A013223

Adjacent sequences:  A056314 A056315 A056316 * A056318 A056319 A056320

KEYWORD

nonn

AUTHOR

Marks R. Nester

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 20 14:27 EDT 2019. Contains 322310 sequences. (Running on oeis4.)