Fibonacci sequence beginning 1, 6.

Terms

a(0) =1a(1) =6a(2) =7a(3) =13a(4) =20a(5) =33a(6) =53a(7) =86a(8) =139a(9) =225a(10) =364a(11) =589a(12) =953a(13) =1542a(14) =2495a(15) =4037a(16) =6532a(17) =10569a(18) =17101a(19) =27670a(20) =44771a(21) =72441a(22) =117212a(23) =189653a(24) =306865a(25) =496518a(26) =803383a(27) =1299901a(28) =2103284a(29) =3403185