a(n) = 2^n + 9.

Terms

a(0) =10a(1) =11a(2) =13a(3) =17a(4) =25a(5) =41a(6) =73a(7) =137a(8) =265a(9) =521a(10) =1033a(11) =2057a(12) =4105a(13) =8201a(14) =16393a(15) =32777a(16) =65545a(17) =131081a(18) =262153a(19) =524297a(20) =1048585a(21) =2097161a(22) =4194313a(23) =8388617a(24) =16777225a(25) =33554441a(26) =67108873a(27) =134217737a(28) =268435465a(29) =536870921