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A050488 as a simple table

na(n)
00
11
25
315
437
583
6177
7367
8749
91515
103049
116119
1212261
1324547
1449121
1598271
16196573
17393179
18786393
191572823
203145685
216291411
2212582865
2325165775
2450331597
25100663243
26201326537
27402653127
28805306309
291610612675
303221225409
316442450879
3212884901821
3325769803707

[0,1,5,15,37,83,177,367,749,1515,3049,6119,12261,
 24547,49121,98271,196573,393179,786393,1572823,
 3145685,6291411,12582865,25165775,50331597,
 100663243,201326537,402653127,805306309,
 1610612675,3221225409,6442450879,12884901821,
 25769803707]