a(1)=2; thereafter, convert a(n-1) from base 10 to base 2 but regard the result as a base 10 number.

A008559

a(1)=2; thereafter, convert a(n-1) from base 10 to base 2 but regard the result as a base 10 number.

Terms

    a(0) =2a(1) =10a(2) =1010a(3) =1111110010

External references