OFFSET
1,3
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..200
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 79
FORMULA
Doubles (index 2+) under "CIK" (necklace, indistinct, unlabeled) transform.
PROG
(PARI)
CIK(p, n)={sum(d=1, n, eulerphi(d)/d*log(subst(1/(1+O(x*x^(n\d))-p), x, x^d)))}
seq(n)={my(p=x); for(i=2, n, p+=x^i*polcoeff(CIK(p, i), i)); Vecrev(p/x)} \\ Andrew Howroyd, Jun 21 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved