Fibonacci sequence beginning 4, 18.

Terms

a(0) =4a(1) =18a(2) =22a(3) =40a(4) =62a(5) =102a(6) =164a(7) =266a(8) =430a(9) =696a(10) =1126a(11) =1822a(12) =2948a(13) =4770a(14) =7718a(15) =12488a(16) =20206a(17) =32694a(18) =52900a(19) =85594a(20) =138494a(21) =224088a(22) =362582a(23) =586670a(24) =949252a(25) =1535922a(26) =2485174a(27) =4021096a(28) =6506270a(29) =10527366