%I #10 Dec 31 2023 10:15:50
%S 2,2,12,72,720,6480,90720,1209600,20321280,359251200,7424524800,
%T 160465536000,3923023104000,101213996083200,2853345470976000,
%U 85364982743040000,2742350070620160000,93039294691639296000
%N Number of aperiodic necklaces with n labeled beads of 2 colors.
%H C. G. Bower, <a href="/transforms2.html">Transforms (2)</a>
%H <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%F "CHJ" (necklace, identity, labeled) transform of 2, 0, 0, 0...
%F n! * A001037.
%Y Cf. A001037.
%K nonn
%O 1,1
%A _Christian G. Bower_