%I A051013
%S A051013 1,2,4,7,13,23,40,65,106,169,278,443,705,1117,1760,2692,4151,6314,9526,
%T A051013 14127,20944,30848,45589,66495,96847,140840,204380,293822,425859
%N A051013 Number of nonaveraging sequences on {1,2,...,n}.
%H A051013 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               NonaveragingSequence.html">Link to a section of The World of Mathematics.</
               a>
%e A051013 The only subset of s = {1,2,3} that contains a 3-term arithmetic progression 
               is s itself, so a(3) = 7.
%Y A051013 Sequence in context: A054150 A130709 A073832 this_sequence A128609 A114832 
               A136299
%Y A051013 Adjacent sequences: A051010 A051011 A051012 this_sequence A051014 A051015 
               A051016
%K A051013 nonn
%O A051013 0,2
%A A051013 Eric Weisstein (eric(AT)weisstein.com)
%E A051013 More terms from John W. Layman (layman(AT)math.vt.edu), Nov 27 2001