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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 5 |
| 3 | 124 |
| 4 | 624 |
| 5 | 2062 |
| 6 | 35880 |
| 7 | 247664 |
| 8 | 921726 |
| 9 | 10840453 |
| 10 | 85630246 |
| 11 | 402667023 |
| 12 | 5025751755 |
| 13 | 34251076327 |
[15,5,124,624,2062,35880,247664,921726,10840453, 85630246,402667023,5025751755,34251076327] |