A032182 - OEIS

%I #18 May 29 2020 02:05:15

%S 2,5,23,156,1409,15908,215529,3406770,61542033,1250700672,28241802929,

%T 701494286870,19008349975497,557990502346020,17639808964667241,

%U 597481099591875594,21586547569205365409,828650020968205107752,33680822283049282596225

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

%H Christian G. Bower, <a href="/transforms2.html">Transforms (2)</a>

%H INRIA Algorithms Project, <a href="http://ecs.inria.fr/services/structure?nbr=837">Encyclopedia of Combinatorial Structures 837</a>

%H <a href="/index/Ne#necklaces">Index entries for sequences related to necklaces</a>

%F E.g.f.: A(x) = log(1/(2-x-exp(x))). - _Sean A. Irvine_, May 28 2020

%F a(n) ~ (n-1)! / (2 - LambertW(exp(2)))^n. - _Vaclav Kotesovec_, May 29 2020

%Y Cf. A226571.

%K nonn

%O 1,1

%A _Christian G. Bower_

%E More terms from _Sean A. Irvine_, May 28 2020