Fibonacci sequence beginning 1, 27.

Terms

a(0) =1a(1) =27a(2) =28a(3) =55a(4) =83a(5) =138a(6) =221a(7) =359a(8) =580a(9) =939a(10) =1519a(11) =2458a(12) =3977a(13) =6435a(14) =10412a(15) =16847a(16) =27259a(17) =44106a(18) =71365a(19) =115471a(20) =186836a(21) =302307a(22) =489143a(23) =791450a(24) =1280593a(25) =2072043a(26) =3352636a(27) =5424679a(28) =8777315a(29) =14201994