a(n) = 2*a(n-1) + 3 for n>1, a(1)=14.

Terms

a(0) =14a(1) =31a(2) =65a(3) =133a(4) =269a(5) =541a(6) =1085a(7) =2173a(8) =4349a(9) =8701a(10) =17405a(11) =34813a(12) =69629a(13) =139261a(14) =278525a(15) =557053a(16) =1114109a(17) =2228221a(18) =4456445a(19) =8912893a(20) =17825789a(21) =35651581a(22) =71303165a(23) =142606333a(24) =285212669a(25) =570425341a(26) =1140850685a(27) =2281701373a(28) =4563402749a(29) =9126805501