a(n) = 192*2^n - 31 (n>=1).

Terms

a(0) =353a(1) =737a(2) =1505a(3) =3041a(4) =6113a(5) =12257a(6) =24545a(7) =49121a(8) =98273a(9) =196577a(10) =393185a(11) =786401a(12) =1572833a(13) =3145697a(14) =6291425a(15) =12582881a(16) =25165793a(17) =50331617a(18) =100663265a(19) =201326561a(20) =402653153a(21) =805306337a(22) =1610612705a(23) =3221225441a(24) =6442450913a(25) =12884901857a(26) =25769803745a(27) =51539607521