Powers of fifth root of 21 rounded down.

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =11a(5) =21a(6) =38a(7) =70a(8) =130a(9) =239a(10) =441a(11) =810a(12) =1490a(13) =2740a(14) =5037a(15) =9261a(16) =17025a(17) =31300a(18) =57542a(19) =105787a(20) =194481a(21) =357537a(22) =657301a(23) =1208394a(24) =2221532a(25) =4084101a(26) =7508277a(27) =13803340a(28) =25376285a(29) =46652176