%I #9 Mar 11 2014 01:32:52
%S 1,10,15,660,693,990,1023,2704680,2706729,2839914,2841963,4057020,
%T 4059069,4192254,4194303,45377005980240,45377014368849,45411382499922,
%U 45411390888531,47645856279252,47645864667861,47680232798934,47680241187543
%N a(1)=1. For n>1, a(n) equals the smallest number > a(n1) of the form a(k) U j U a(k) U j, where U represents concatenation (written in decimal) of the binary representation of the arguments, where 1 <= k < n, and j = {0} or {1}.
%C Each term of this sequence exists in sequence A175336.
%e 10 (decimal), a term of the sequence, written in binary is 1010. Letting j={0}, we have that the decimal value of 1010 U 0 U 1010 U 0 = 1010010100, which is 660, is in the sequence.
%Y Cf. A175336
%K base,nonn
%O 1,2
%A _Leroy Quet_, Apr 14 2010
%E More terms from _Max Alekseyev_, Jun 13 2011
