Powers of cube root of 16 rounded down.

Terms

a(0) =1a(1) =2a(2) =6a(3) =16a(4) =40a(5) =101a(6) =256a(7) =645a(8) =1625a(9) =4096a(10) =10321a(11) =26007a(12) =65536a(13) =165140a(14) =416127a(15) =1048576a(16) =2642245a(17) =6658042a(18) =16777216a(19) =42275935a(20) =106528681a(21) =268435456a(22) =676414963a(23) =1704458900a(24) =4294967296a(25) =10822639409a(26) =27271342415a(27) =68719476736a(28) =173162230554a(29) =436341478645