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A100105 as a simple table

na(n)
12
25
327
4121
52037
68179
7131055
8524269
98388585
10536870883
112147483617
12137438953435
132199023255511
148796093022165
15140737488355281
169007199254740939
17576460752303423429
182305843009213693891

[2,5,27,121,2037,8179,131055,524269,8388585,
 536870883,2147483617,137438953435,2199023255511,
 8796093022165,140737488355281,9007199254740939,
 576460752303423429,2305843009213693891]