%I A053634
%S A053634 2,3,4,7,10,18,30,54,94,176,316,591,1096,2058,3856,7301,13798,26244,
%T A053634 49940,95373,182362,349626,671092,1290714,2485534,4793790,9256396,
%U A053634 17896284,34636834,67109898,130150588,252647064,490853416,954440950
%N A053634 Sum_{ d divides n } phi(d)*2^(n/d)/(2n).
%Y A053634 Cf. A000016, A053635.
%Y A053634 This is half A000031.
%Y A053634 Sequence in context: A082958 A166012 A060166 this_sequence A094863 A094862 
               A104722
%Y A053634 Adjacent sequences: A053631 A053632 A053633 this_sequence A053635 A053636 
               A053637
%K A053634 nonn
%O A053634 3,1
%A A053634 N. J. A. Sloane (njas(AT)research.att.com), Mar 23 2000