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A146412 as a simple table

na(n)
11
21
31
41
55
625
759
8371
91829
1012351
11114789
121410427
1319272237
14385707683
158418983493
16256858401273

[1,1,1,1,5,25,59,371,1829,12351,114789,1410427,
 19272237,385707683,8418983493,256858401273]