Fibonacci sequence beginning 4, 15.

Terms

a(0) =4a(1) =15a(2) =19a(3) =34a(4) =53a(5) =87a(6) =140a(7) =227a(8) =367a(9) =594a(10) =961a(11) =1555a(12) =2516a(13) =4071a(14) =6587a(15) =10658a(16) =17245a(17) =27903a(18) =45148a(19) =73051a(20) =118199a(21) =191250a(22) =309449a(23) =500699a(24) =810148a(25) =1310847a(26) =2120995a(27) =3431842a(28) =5552837a(29) =8984679