Round (3/2)^n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =5a(7) =8a(8) =11a(9) =17a(10) =26a(11) =38a(12) =58a(13) =86a(14) =130a(15) =195a(16) =292a(17) =438a(18) =657a(19) =985a(20) =1478a(21) =2217a(22) =3325a(23) =4988a(24) =7482a(25) =11223a(26) =16834a(27) =25251a(28) =37877a(29) =56815