Powers of fourth root of 20 rounded down.

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =20a(5) =42a(6) =89a(7) =189a(8) =400a(9) =845a(10) =1788a(11) =3782a(12) =8000a(13) =16917a(14) =35777a(15) =75659a(16) =160000a(17) =338358a(18) =715541a(19) =1513186a(20) =3200000a(21) =6767176a(22) =14310835a(23) =30263731a(24) =64000000a(25) =135343521a(26) =286216701a(27) =605274629a(28) =1280000000a(29) =2706870434