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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A065180 Number of site swap patterns with 4 balls and exact period n. 5
1, 4, 20, 90, 420, 1910, 8820, 40590, 187880, 871494, 4057620, 18945960, 88738020, 416787030, 1962922276, 9268287390, 43868210820, 208109782580, 989400443220, 4713395564772, 22497100553820, 107572434560790, 515241748300020 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

Juggling Information Service, Site Swap FAQs

MAPLE

[seq(DistSS(p, 4), p=1..60)];

A065180 := proc(n)

    add( mobius(n/d)*(5^d-4^d), d=numtheory[divisors](n)) /n ;

end proc:

seq(A065180(n), n=1..30) ; # R. J. Mathar, Aug 05 2015

MATHEMATICA

a[n_] := DivisorSum[n, MoebiusMu[n/#]*(5^# - 4^#)&]/n; Array[a, 25] (* Jean-Fran├žois Alcover, Mar 06 2016 *)

CROSSREFS

Row 4 of A065177. Cf. A065178, A065179.

Sequence in context: A017964 A017965 A180284 * A229245 A328153 A070733

Adjacent sequences:  A065177 A065178 A065179 * A065181 A065182 A065183

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 19 2001

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 December 13 06:26 EST 2019. Contains 329968 sequences. (Running on oeis4.)