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A253917 as a simple table

na(n)
172
2738
32758
416777232
51073741856
6282429536508
795367431640650
8150094635296999148
9221073919720733357899812
10311973482284542371301330321821976098
111329227995784915872903807060280344640
1285070591730234615865843651857942052992

[72,738,2758,16777232,1073741856,282429536508,
 95367431640650,150094635296999148,
 221073919720733357899812,
 311973482284542371301330321821976098,
 1329227995784915872903807060280344640,
 85070591730234615865843651857942052992]