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A006988 as a simple table

na(n)
02
129
2541
37919
4104729
51299709
615485863
7179424673
82038074743
922801763489
10252097800623
112760727302517
1229996224275833
13323780508946331
143475385758524527
1537124508045065437
16394906913903735329
174185296581467695669
1844211790234832169331

[2,29,541,7919,104729,1299709,15485863,179424673,
 2038074743,22801763489,252097800623,2760727302517,
 29996224275833,323780508946331,3475385758524527,
 37124508045065437,394906913903735329,
 4185296581467695669,44211790234832169331]