Value of A063882 at start of n-th generation of terms.

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =24a(5) =49a(6) =98a(7) =197a(8) =394a(9) =788a(10) =1577a(11) =3154a(12) =6309a(13) =12618a(14) =25236a(15) =50473a(16) =100946a(17) =201893