Fibonacci sequence beginning 4, 17.

Terms

a(0) =4a(1) =17a(2) =21a(3) =38a(4) =59a(5) =97a(6) =156a(7) =253a(8) =409a(9) =662a(10) =1071a(11) =1733a(12) =2804a(13) =4537a(14) =7341a(15) =11878a(16) =19219a(17) =31097a(18) =50316a(19) =81413a(20) =131729a(21) =213142a(22) =344871a(23) =558013a(24) =902884a(25) =1460897a(26) =2363781a(27) =3824678a(28) =6188459a(29) =10013137