%I A007149 M0017
%S A007149 0,0,1,2,0,1,2,2,1,2,4,3,4,4,5,5,4,5,8,6,8,7,8,8,9,9,10,10,15,11,12,12,
%T A007149 11,12,16,13,16,14,15,15,17,16,17,17,19,18,19,19,20,20,21,21,23,22,23,
               23
%N A007149 2-part of number of graphs on n nodes.
%D A007149 Steven C. Cater and Robert W. Robinson, "Exponents of 2 in the numbers 
               of unlabeled graphs and tournaments," Congressus Numerantium, 82 
               (1991), pp. 139-155.
%D A007149 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A007149 Power of 2 dividing A000088.
%Y A007149 Sequence in context: A065051 A084665 A035392 this_sequence A028832 A033773 
               A029275
%Y A007149 Adjacent sequences: A007146 A007147 A007148 this_sequence A007150 A007151 
               A007152
%K A007149 nonn
%O A007149 0,4
%A A007149 N. J. A. Sloane (njas(AT)research.att.com).