Fibonacci sequence beginning 3, 20.

Terms

a(0) =3a(1) =20a(2) =23a(3) =43a(4) =66a(5) =109a(6) =175a(7) =284a(8) =459a(9) =743a(10) =1202a(11) =1945a(12) =3147a(13) =5092a(14) =8239a(15) =13331a(16) =21570a(17) =34901a(18) =56471a(19) =91372a(20) =147843a(21) =239215a(22) =387058a(23) =626273a(24) =1013331a(25) =1639604a(26) =2652935a(27) =4292539a(28) =6945474a(29) =11238013