a(n) = 96*2^n + 80.

Terms

a(0) =176a(1) =272a(2) =464a(3) =848a(4) =1616a(5) =3152a(6) =6224a(7) =12368a(8) =24656a(9) =49232a(10) =98384a(11) =196688a(12) =393296a(13) =786512a(14) =1572944a(15) =3145808a(16) =6291536a(17) =12582992a(18) =25165904a(19) =50331728a(20) =100663376a(21) =201326672a(22) =402653264a(23) =805306448a(24) =1610612816a(25) =3221225552a(26) =6442451024a(27) =12884901968a(28) =25769803856a(29) =51539607632