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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 15 |
| 2 | 195 |
| 3 | 3315 |
| 4 | 96135 |
| 5 | 2980185 |
| 6 | 128147955 |
| 7 | 6022953885 |
| 8 | 367400186985 |
| 9 | 24615812527995 |
| 10 | 1944649189711605 |
| 11 | 161405882746063215 |
| 12 | 16301994157352384715 |
| 13 | 1679105398207295625645 |
| 14 | 189738909997424405697885 |
| 15 | 24096841569672899523631395 |
[3,15,195,3315,96135,2980185,128147955,6022953885, 367400186985,24615812527995,1944649189711605, 161405882746063215,16301994157352384715, 1679105398207295625645,189738909997424405697885, 24096841569672899523631395] |