Powers of fifth root of 21 rounded up.

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =12a(5) =21a(6) =39a(7) =71a(8) =131a(9) =240a(10) =441a(11) =811a(12) =1491a(13) =2741a(14) =5038a(15) =9261a(16) =17026a(17) =31301a(18) =57543a(19) =105788a(20) =194481a(21) =357538a(22) =657302a(23) =1208395a(24) =2221533a(25) =4084101a(26) =7508278a(27) =13803341a(28) =25376286a(29) =46652177