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A189338 as a simple table

na(n)
115
2225
33375
436626
5390721
63988168
742069350
8442969881
94709354541
1049857094654
11528436125424
125591212296038
1359196669906872
14626540356943069
156633322246811551
1670220475509151710
17743409267344795743

[15,225,3375,36626,390721,3988168,42069350,
 442969881,4709354541,49857094654,528436125424,
 5591212296038,59196669906872,626540356943069,
 6633322246811551,70220475509151710,
 743409267344795743]