OFFSET
0,3
LINKS
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 796
FORMULA
G.f. satisfies A(x) = Sum_{j>=1} (phi(j)/j) * log( 1/(1-B(x^j)) ), where B(x) = x * exp( Sum_{j>=1} (-1)^(j+1) * S(x^j) / j ). - Sean A. Irvine, Dec 02 2021
MAPLE
spec := [S, {B=Prod(C, Z), C=PowerSet(S), S=Cycle(B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
encyclopedia(AT)pommard.inria.fr, Jan 25 2000
EXTENSIONS
More terms from Sean A. Irvine, Dec 02 2021
STATUS
approved