Powers of cube root of 4 rounded down.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =10a(6) =16a(7) =25a(8) =40a(9) =64a(10) =101a(11) =161a(12) =256a(13) =406a(14) =645a(15) =1024a(16) =1625a(17) =2580a(18) =4096a(19) =6501a(20) =10321a(21) =16384a(22) =26007a(23) =41285a(24) =65536a(25) =104031a(26) =165140a(27) =262144a(28) =416127a(29) =660561