Powers of fourth root of 3 rounded up.

Terms

a(0) =1a(1) =2a(2) =2a(3) =3a(4) =3a(5) =4a(6) =6a(7) =7a(8) =9a(9) =12a(10) =16a(11) =21a(12) =27a(13) =36a(14) =47a(15) =62a(16) =81a(17) =107a(18) =141a(19) =185a(20) =243a(21) =320a(22) =421a(23) =554a(24) =729a(25) =960a(26) =1263a(27) =1662a(28) =2187a(29) =2879