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%I #6 Mar 30 2012 17:37:12
%S 6,42,558,8640,151350,2858562,57010422,1183184640,25319269980,
%T 555099603450,12411545042094,282060978777792,6498315236374338,
%U 151469476107975354,3566331985691591550,84709091524784348160
%N (1/n) * sum over d|n of {mu(n/d) * (3d)! / d!^3}.
%H <a href="/index/Lu#Lyndon">Index entries for sequences related to Lyndon words</a>
%Y Inverse Witt transform of A006174. a(n) = A029808(n)*6. a(n) = A074655(n)*3.
%K nonn
%O 1,1
%A _Christian G. Bower_, Aug 29 2002
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