a(n) = floor(3^n / 2^n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =11a(7) =17a(8) =25a(9) =38a(10) =57a(11) =86a(12) =129a(13) =194a(14) =291a(15) =437a(16) =656a(17) =985a(18) =1477a(19) =2216a(20) =3325a(21) =4987a(22) =7481a(23) =11222a(24) =16834a(25) =25251a(26) =37876a(27) =56815a(28) =85222a(29) =127834