A017986 Powers of cube root of 4 rounded to nearest integer.

1, 2, 3, 4, 6, 10, 16, 25, 40, 64, 102, 161, 256, 406, 645, 1024, 1625, 2580, 4096, 6502, 10321, 16384, 26008, 41285, 65536, 104032, 165140, 262144, 416128, 660561, 1048576, 1664511, 2642246, 4194304, 6658043