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A189774 as a simple table

na(n)
115
2225
33375
437976
5418550
64461435
748633913
8530389481
95817065520
1063680392402
11697353409375
127631111846379
1383521134087527
14914046929969572
1510004056595349672
16109490279695417318
171198342710234669673

[15,225,3375,37976,418550,4461435,48633913,
 530389481,5817065520,63680392402,697353409375,
 7631111846379,83521134087527,914046929969572,
 10004056595349672,109490279695417318,
 1198342710234669673]