Powers of fourth root of 15 rounded up.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =30a(6) =59a(7) =115a(8) =225a(9) =443a(10) =872a(11) =1715a(12) =3375a(13) =6642a(14) =13072a(15) =25725a(16) =50625a(17) =99630a(18) =196070a(19) =385864a(20) =759375a(21) =1494443a(22) =2941047a(23) =5787950a(24) =11390625a(25) =22416633a(26) =44115701a(27) =86819244a(28) =170859375