A032182 "CIJ" (necklace, indistinct, labeled) transform of 2,1,1,1...

2, 5, 23, 156, 1409, 15908, 215529, 3406770, 61542033, 1250700672, 28241802929, 701494286870, 19008349975497, 557990502346020, 17639808964667241, 597481099591875594, 21586547569205365409, 828650020968205107752, 33680822283049282596225

Offset: 1

Author

Christian G. Bower

Keywords

• nonn

Links

• Christian G. Bower, Transforms (2)
• INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 837
• Index entries for sequences related to necklaces

Crossrefs

Cf. A226571.

Formula

E.g.f.: A(x) = log(1/(2-x-exp(x))). - Sean A. Irvine, May 28 2020

a(n) ~ (n-1)! / (2 - LambertW(exp(2)))^n. - Vaclav Kotesovec, May 29 2020

Extensions

More terms from Sean A. Irvine, May 28 2020