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A221664 as a simple table

na(n)
18
264
3512
43772
532768
6262144
72097152
816777216
9134140928
101073741824
118589934592
1268719476736
13549755813888
144398033385216
1535184372088832
16281474976710656
172251799813685248
1818014398509481984
19144115185909972992

[8,64,512,3772,32768,262144,2097152,16777216,
 134140928,1073741824,8589934592,68719476736,
 549755813888,4398033385216,35184372088832,
 281474976710656,2251799813685248,
 18014398509481984,144115185909972992]