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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 376 |
| 3 | 8805 |
| 4 | 207901 |
| 5 | 4903920 |
| 6 | 115686901 |
| 7 | 2729093235 |
| 8 | 64380355576 |
| 9 | 1518756918825 |
| 10 | 35828050696201 |
| 11 | 845197277027040 |
| 12 | 19938523685081401 |
| 13 | 470357320740846855 |
| 14 | 11095907233164566776 |
| 15 | 261756651587724670845 |
[15,376,8805,207901,4903920,115686901,2729093235, 64380355576,1518756918825,35828050696201, 845197277027040,19938523685081401, 470357320740846855,11095907233164566776, 261756651587724670845] |