Fibonacci sequence beginning 13, 6.

Terms

a(0) =13a(1) =6a(2) =19a(3) =25a(4) =44a(5) =69a(6) =113a(7) =182a(8) =295a(9) =477a(10) =772a(11) =1249a(12) =2021a(13) =3270a(14) =5291a(15) =8561a(16) =13852a(17) =22413a(18) =36265a(19) =58678a(20) =94943a(21) =153621a(22) =248564a(23) =402185a(24) =650749a(25) =1052934a(26) =1703683a(27) =2756617a(28) =4460300a(29) =7216917