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A123868 as a simple table

na(n)
10
24095
3531440
416777215
5244140624
62176782335
713841287200
868719476735
9282429536480
10999999999999
113138428376720
128916100448255
1323298085122480
1456693912375295
15129746337890624
16281474976710655
17582622237229760
181156831381426175
192213314919066160

[0,4095,531440,16777215,244140624,2176782335,
 13841287200,68719476735,282429536480,999999999999,
 3138428376720,8916100448255,23298085122480,
 56693912375295,129746337890624,281474976710655,
 582622237229760,1156831381426175,2213314919066160]