Fibonacci sequence beginning 2, 18.

Terms

a(0) =2a(1) =18a(2) =20a(3) =38a(4) =58a(5) =96a(6) =154a(7) =250a(8) =404a(9) =654a(10) =1058a(11) =1712a(12) =2770a(13) =4482a(14) =7252a(15) =11734a(16) =18986a(17) =30720a(18) =49706a(19) =80426a(20) =130132a(21) =210558a(22) =340690a(23) =551248a(24) =891938a(25) =1443186a(26) =2335124a(27) =3778310a(28) =6113434a(29) =9891744