Fibonacci sequence beginning 2, 20.

Terms

a(0) =2a(1) =20a(2) =22a(3) =42a(4) =64a(5) =106a(6) =170a(7) =276a(8) =446a(9) =722a(10) =1168a(11) =1890a(12) =3058a(13) =4948a(14) =8006a(15) =12954a(16) =20960a(17) =33914a(18) =54874a(19) =88788a(20) =143662a(21) =232450a(22) =376112a(23) =608562a(24) =984674a(25) =1593236a(26) =2577910a(27) =4171146a(28) =6749056a(29) =10920202