%I A035043
%S A035043 0,2,1,3,4,5,6,7,8,9,20,22,21,23,24,25,26,27,28,29,10,12,11,13,14,
%T A035043 15,16,17,18,19,30,32,31,33,34,35,36,37,38,39,40,42,41,43,44,45,46,
%U A035043 47,48,49,50,52,51,53,54,55,56,57,58,59,60,62,61,63,64,65,66,67,68
%N A035043 Exchange 1 and 2!.
%Y A035043 Sequence in context: A117407 A082470 A101204 this_sequence A155963 A058684 
               A109920
%Y A035043 Adjacent sequences: A035040 A035041 A035042 this_sequence A035044 A035045 
               A035046
%K A035043 nonn,base,easy
%O A035043 0,2
%A A035043 N. J. A. Sloane (njas(AT)research.att.com).