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A146578 as a simple table

na(n)
11
21
31
417
557
6457
77575
8206575
97284891
10429058537
1143146239725
126893658124929
131724211995309777

[1,1,1,17,57,457,7575,206575,7284891,429058537,
 43146239725,6893658124929,1724211995309777]