a(n) = 102*2^n - 96 (n>=1).

Terms

a(0) =108a(1) =312a(2) =720a(3) =1536a(4) =3168a(5) =6432a(6) =12960a(7) =26016a(8) =52128a(9) =104352a(10) =208800a(11) =417696a(12) =835488a(13) =1671072a(14) =3342240a(15) =6684576a(16) =13369248a(17) =26738592a(18) =53477280a(19) =106954656a(20) =213909408a(21) =427818912a(22) =855637920a(23) =1711275936a(24) =3422551968a(25) =6845104032a(26) =13690208160a(27) =27380416416a(28) =54760832928a(29) =109521665952