Fibonacci sequence beginning 2, 28.

Terms

a(0) =2a(1) =28a(2) =30a(3) =58a(4) =88a(5) =146a(6) =234a(7) =380a(8) =614a(9) =994a(10) =1608a(11) =2602a(12) =4210a(13) =6812a(14) =11022a(15) =17834a(16) =28856a(17) =46690a(18) =75546a(19) =122236a(20) =197782a(21) =320018a(22) =517800a(23) =837818a(24) =1355618a(25) =2193436a(26) =3549054a(27) =5742490a(28) =9291544a(29) =15034034