a(n) = 2*a(n-1)+3 for n > 1, a(1) = 10.

Terms

a(0) =10a(1) =23a(2) =49a(3) =101a(4) =205a(5) =413a(6) =829a(7) =1661a(8) =3325a(9) =6653a(10) =13309a(11) =26621a(12) =53245a(13) =106493a(14) =212989a(15) =425981a(16) =851965a(17) =1703933a(18) =3407869a(19) =6815741a(20) =13631485a(21) =27262973a(22) =54525949a(23) =109051901a(24) =218103805a(25) =436207613a(26) =872415229a(27) =1744830461a(28) =3489660925a(29) =6979321853