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A125908 as a simple table

na(n)
18
264
3512
44096
532768
6262144
72092112
816595776
9130437728
101013866624
117788438512
1259145432256
13444357721088
143306242197504
1524389881261712
16178578361769536
171299058046034848
189397253451942784
1967653687455953712
20485065987257543616

[8,64,512,4096,32768,262144,2092112,16595776,
 130437728,1013866624,7788438512,59145432256,
 444357721088,3306242197504,24389881261712,
 178578361769536,1299058046034848,9397253451942784,
 67653687455953712,485065987257543616]