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To get the 3rd term, for example, note that 2nd term has three (11 in binary!) 1's and one (1) 0, giving 11 1 1 0.
3

%I #13 Apr 04 2017 04:46:20

%S 10,1110,11110,100110,1110010110,111100111010110,

%T 100110011110111010110,1110010110010011011110111010110,

%U 1111001110101100111001011010011011110111010110

%N To get the 3rd term, for example, note that 2nd term has three (11 in binary!) 1's and one (1) 0, giving 11 1 1 0.

%H John Cerkan, <a href="/A001391/b001391.txt">Table of n, a(n) for n = 1..17</a>

%Y Cf. A001387.

%K nonn,base

%O 1,1

%A _N. J. A. Sloane_, _Thomas L. York_