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A250686 as a simple table

na(n)
12541
213906
374631
4383440
51848953
68474002
737322413
8159438246
9665575403
102731006288
1111064772389
1244421077632
13177194842907
14703795289106
152787900969927
1611027407758154
1743593798115489
18172349301152440

[2541,13906,74631,383440,1848953,8474002,37322413,
 159438246,665575403,2731006288,11064772389,
 44421077632,177194842907,703795289106,
 2787900969927,11027407758154,43593798115489,
 172349301152440]