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A364857 as a simple table

na(n)
31
415
5225
63781
772078
81550016
937259191
10991980099
1129008029501
12924873082849
1331944725060988
141188568865803032
1547403638535874501
162017753008682107135
1791309129890388047873
184377769140759352823773
19221687675024545322612226

[1,15,225,3781,72078,1550016,37259191,991980099,
 29008029501,924873082849,31944725060988,
 1188568865803032,47403638535874501,
 2017753008682107135,91309129890388047873,
 4377769140759352823773,221687675024545322612226]