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A281503 as a simple table

na(n)
11
23
343
4137
51977
66299
790899
8289617
94179377
1013316083
11192160443
12612250201
138835201001
1428150193163
15406227085603
161294296635297
1718677610736737
1859509495030499
19858763866804299
202736142474767657
2139484460262261017
22125803044344281723

[1,3,43,137,1977,6299,90899,289617,4179377,
 13316083,192160443,612250201,8835201001,
 28150193163,406227085603,1294296635297,
 18677610736737,59509495030499,858763866804299,
 2736142474767657,39484460262261017,
 125803044344281723]