a(0)=8, a(n) = 2*a(n-1) + 2^(n-1) for n > 0.

Terms

a(0) =8a(1) =17a(2) =36a(3) =76a(4) =160a(5) =336a(6) =704a(7) =1472a(8) =3072a(9) =6400a(10) =13312a(11) =27648a(12) =57344a(13) =118784a(14) =245760a(15) =507904a(16) =1048576a(17) =2162688a(18) =4456448a(19) =9175040a(20) =18874368a(21) =38797312a(22) =79691776a(23) =163577856a(24) =335544320a(25) =687865856a(26) =1409286144a(27) =2885681152a(28) =5905580032a(29) =12079595520