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A291832 as a simple table

na(n)
164
28192
3139968
41048576
55000000
617915904
752706752
8134217728
9306110016
10640000000
111247178944
122293235712
134015905088
146746464256
1510935000000
1617179869184
1726261675072
1839182082048
1957207791296
2081920000000
21115269666624
22159638904832
23217908828608

[64,8192,139968,1048576,5000000,17915904,52706752,
 134217728,306110016,640000000,1247178944,
 2293235712,4015905088,6746464256,10935000000,
 17179869184,26261675072,39182082048,57207791296,
 81920000000,115269666624,159638904832,
 217908828608]