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A145943 as a simple table

na(n)
11
21
317
4101
51439
645325
72541179
8249765423
948546882545
1017503645590565
1111722960747922791

[1,1,17,101,1439,45325,2541179,249765423,
 48546882545,17503645590565,11722960747922791]