Fibonacci sequence beginning 0, 18.

Terms

a(0) =0a(1) =18a(2) =18a(3) =36a(4) =54a(5) =90a(6) =144a(7) =234a(8) =378a(9) =612a(10) =990a(11) =1602a(12) =2592a(13) =4194a(14) =6786a(15) =10980a(16) =17766a(17) =28746a(18) =46512a(19) =75258a(20) =121770a(21) =197028a(22) =318798a(23) =515826a(24) =834624a(25) =1350450a(26) =2185074a(27) =3535524a(28) =5720598a(29) =9256122