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A146730 as a simple table

na(n)
11
21
31
417
549
6253
74269
8109305
92719409
10106590781
118186380289
12970653688319
13155798879951445

[1,1,1,17,49,253,4269,109305,2719409,106590781,
 8186380289,970653688319,155798879951445]