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%I #6 Nov 21 2014 17:24:51
%S 3,64,32,16,8,4,2,1,22,11,232,116,58,29,610,305,6406,3203,67264,33632,
%T 16816,8408,4204,2102,1051,22072,11036,5518,2759,57940,28970,14485,
%U 304186,152093,3193954,1596977,33536518
%N Trajectory of 3 under map n->21n+1 if n odd, n->n/2 if n even
%F a(n) = A033967(n-7), n>=7. - _R. J. Mathar_, Nov 21 2014
%K nonn
%O 0,1
%A _N. J. A. Sloane_.
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