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A222937 as a simple table

na(n)
18
264
3512
44000
532760
6262104
72097152
816777216
9134217728
101073741824
118589499198
1268719476736
13549755813888
144398046511104
1535184372088832
16281474975268864
172251799813683712
1818014398509056000
19144115188075855872

[8,64,512,4000,32760,262104,2097152,16777216,
 134217728,1073741824,8589499198,68719476736,
 549755813888,4398046511104,35184372088832,
 281474975268864,2251799813683712,
 18014398509056000,144115188075855872]