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%I #7 Apr 04 2016 18:52:31
%S 1,2,4,7,10,15,19,26,31,39,45,55,62,73,82,94,104,117,128,142,155,170,
%T 184,200,216,233,250,268,286,305,324,345,365,387,408,431,454,478,502,
%U 527,552,578,604,631,658,687,715,745,774,805,835,868,899
%N Unique increasing sequence satisfying a(n) = a(n-2) + c(n-2); where c( ) is complement of a( ).
%H Ivan Neretin, <a href="/A022939/b022939.txt">Table of n, a(n) for n = 1..10000</a>
%t Fold[Append[#1, #1[[#2]] + Complement[Range[Max@#1 + 1], #1][[#2]]] &, {1, 2}, Range[50]] (* _Ivan Neretin_, Apr 04 2016 *)
%Y Cf. A005228 and references therein.
%K nonn
%O 1,2
%A _Clark Kimberling_
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