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A138728 as a simple table

na(n)
12
23
36
44
57
628
716
831
9496
1064
11127
128128
134096
148191
1533550336
1665536
17131071
188589869056
19262144
20524287
21137438691328
221073741824
232147483647
242305843008139952128
251152921504606846976
262305843009213693951

[2,3,6,4,7,28,16,31,496,64,127,8128,4096,8191,
 33550336,65536,131071,8589869056,262144,524287,
 137438691328,1073741824,2147483647,
 2305843008139952128,1152921504606846976,
 2305843009213693951]