Fibonacci sequence beginning 2, 21.

Terms

a(0) =2a(1) =21a(2) =23a(3) =44a(4) =67a(5) =111a(6) =178a(7) =289a(8) =467a(9) =756a(10) =1223a(11) =1979a(12) =3202a(13) =5181a(14) =8383a(15) =13564a(16) =21947a(17) =35511a(18) =57458a(19) =92969a(20) =150427a(21) =243396a(22) =393823a(23) =637219a(24) =1031042a(25) =1668261a(26) =2699303a(27) =4367564a(28) =7066867a(29) =11434431