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A344121 as a simple table

na(n)
15
247
3243
42301
511905
6112747
7583343
85524601
928583805
10270705447
111400606443
1213264566901
1368629715705
14649963778147
153362856069543
1631848225129201
17164779947407605
181560563031330847
198074217422972643
2076467588535211501
21395636653725659505
223746911838225363547
2319386196032557315743

[5,47,243,2301,11905,112747,583343,5524601,
 28583805,270705447,1400606443,13264566901,
 68629715705,649963778147,3362856069543,
 31848225129201,164779947407605,1560563031330847,
 8074217422972643,76467588535211501,
 395636653725659505,3746911838225363547,
 19386196032557315743]