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A104621 as a simple table

na(n)
07
11
23
37
415
531
663
7127
8247
9493
10983
111959
123903
137775
1415487
1530847
1661447
17122401
18243819
19485679
20967455
211927135
223838783
237646719
2415231991
2530341581
2660439343
27120393007
28239818559
29477709983
30951581183
311895515647
323775799303
337521257025

[7,1,3,7,15,31,63,127,247,493,983,1959,3903,7775,
 15487,30847,61447,122401,243819,485679,967455,
 1927135,3838783,7646719,15231991,30341581,
 60439343,120393007,239818559,477709983,951581183,
 1895515647,3775799303,7521257025]