Fibonacci sequence beginning 2, 12.

Terms

a(0) =2a(1) =12a(2) =14a(3) =26a(4) =40a(5) =66a(6) =106a(7) =172a(8) =278a(9) =450a(10) =728a(11) =1178a(12) =1906a(13) =3084a(14) =4990a(15) =8074a(16) =13064a(17) =21138a(18) =34202a(19) =55340a(20) =89542a(21) =144882a(22) =234424a(23) =379306a(24) =613730a(25) =993036a(26) =1606766a(27) =2599802a(28) =4206568a(29) =6806370