Fibonacci sequence beginning 6, 13.

Terms

a(0) =6a(1) =13a(2) =19a(3) =32a(4) =51a(5) =83a(6) =134a(7) =217a(8) =351a(9) =568a(10) =919a(11) =1487a(12) =2406a(13) =3893a(14) =6299a(15) =10192a(16) =16491a(17) =26683a(18) =43174a(19) =69857a(20) =113031a(21) =182888a(22) =295919a(23) =478807a(24) =774726a(25) =1253533a(26) =2028259a(27) =3281792a(28) =5310051a(29) =8591843