%N Interpret the terms of A069748 having only decimal digits 0 and 1 as binary numbers and then convert those numbers to decimal.
%C May be the same sequence obtained from reading the terms of A002780 having only digits 0,1 in base 2 and converting to decimal.
%e A069748(10)=10101 is the eighth number of A069748 having only digits 0 and 1. The binary number 10101 equals 21 in decimal. Thus a(8)=21.
%Y Cf. A002780.
%A _Vladimir Shevelev_, May 31 2011