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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A056320 Number of primitive (aperiodic) reversible strings with n beads using exactly four different colors. 1

%I

%S 0,0,0,12,120,780,4212,20412,93360,409260,1749780,7338000,30394560,

%T 124700928,508291692,2061586800,8332140720,33585682920,135116412660,

%U 542785390680,2178110585388,8733343485120

%N Number of primitive (aperiodic) reversible strings with n beads using exactly four different colors.

%C A string and its reverse are considered to be equivalent.

%D 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]

%F sum mu(d)*A056311(n/d) where d|n.

%Y Cf. A056315.

%K nonn

%O 1,4

%A _Marks R. Nester_

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 August 22 16:17 EDT 2019. Contains 326178 sequences. (Running on oeis4.)