a(n) = 16*(2^n + 1).

Terms

a(0) =32a(1) =48a(2) =80a(3) =144a(4) =272a(5) =528a(6) =1040a(7) =2064a(8) =4112a(9) =8208a(10) =16400a(11) =32784a(12) =65552a(13) =131088a(14) =262160a(15) =524304a(16) =1048592a(17) =2097168a(18) =4194320a(19) =8388624a(20) =16777232a(21) =33554448a(22) =67108880a(23) =134217744a(24) =268435472a(25) =536870928a(26) =1073741840a(27) =2147483664a(28) =4294967312a(29) =8589934608