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A240552 as a simple table

na(n)
12
219
337
4109
55167
646441
7117307
887211
9530713
1052579
11590077
121801
13937
14132049
15811
1638737
175653
18465841
19236377
2069481
21613
225966803
231117
247561
256597973
26102966067
2719927
28102547
2910435069
30120871
311538083
3218837001
33221401
34745903
35612740917
3655117

[2,19,37,109,5167,46441,117307,87211,530713,52579,
 590077,1801,937,132049,811,38737,5653,465841,
 236377,69481,613,5966803,1117,7561,6597973,
 102966067,19927,102547,10435069,120871,1538083,
 18837001,221401,745903,612740917,55117]