|
Search: id:A052825
|
|
| |
|
| 0, 0, 1, 3, 6, 11, 18, 31, 50, 85, 144, 251, 438, 789, 1420, 2601, 4792, 8907, 16618, 31219, 58814
(list; graph; listen)
|
|
|
OFFSET
|
0,4
|
|
|
LINKS
|
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 790
|
|
FORMULA
|
G.f.: -x/(-1+x)*Sum(numtheory[phi](j[1])/j[1]*ln((x^j[1]-1)/(2*x^j[1]-1)), j[1]=1 .. infinity)
|
|
MAPLE
|
spec := [S, {B=Cycle(C), C=Sequence(Z, 1 <= card), S=Prod(C, B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
|
|
CROSSREFS
|
Sequence in context: A066778 A123629 A053992 this_sequence A003082 A058053 A091094
Adjacent sequences: A052822 A052823 A052824 this_sequence A052826 A052827 A052828
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
|
|
|
Search completed in 0.002 seconds
|
