Here is a sequence :
01 10 1001 10010110 1001011001101001 .....

Let us write the same sequence without spaces

01101001100101101001011001101001 ....
Starting from left to right and replacing each digit one by its rank
2 3 5 8 9 12 14 15 17
Can you find the formula to compute the sum S(n) where n is nth digit 1?
Example :
S(5)=2+3+5+8+9=27
S(6)=27+12=39
S(7)=39+14=53
and so on