Powers of fourth root of 21 rounded up.

Terms

a(0) =1a(1) =3a(2) =5a(3) =10a(4) =21a(5) =45a(6) =97a(7) =207a(8) =441a(9) =945a(10) =2021a(11) =4327a(12) =9261a(13) =19825a(14) =42440a(15) =90850a(16) =194481a(17) =416325a(18) =891224a(19) =1907839a(20) =4084101a(21) =8742816a(22) =18715702a(23) =40064613a(24) =85766121a(25) =183599119a(26) =393029742a(27) =841356859a(28) =1801088541