Fibonacci sequence beginning 0, 13.

Terms

a(0) =0a(1) =13a(2) =13a(3) =26a(4) =39a(5) =65a(6) =104a(7) =169a(8) =273a(9) =442a(10) =715a(11) =1157a(12) =1872a(13) =3029a(14) =4901a(15) =7930a(16) =12831a(17) =20761a(18) =33592a(19) =54353a(20) =87945a(21) =142298a(22) =230243a(23) =372541a(24) =602784a(25) =975325a(26) =1578109a(27) =2553434a(28) =4131543a(29) =6684977