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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 495 |
| 4 | 29015 |
| 5 | 2666475 |
| 6 | 354343275 |
| 7 | 64361872575 |
| 8 | 15331195839375 |
| 9 | 4639834754377875 |
| 10 | 1739923436670397875 |
| 11 | 792214640482949058375 |
| 12 | 430673843640390204684375 |
| 13 | 275621285783640234105646875 |
| 14 | 205164378528197702536594546875 |
| 15 | 175791115887829825909515376359375 |
[0,1,15,495,29015,2666475,354343275,64361872575, 15331195839375,4639834754377875, 1739923436670397875,792214640482949058375, 430673843640390204684375, 275621285783640234105646875, 205164378528197702536594546875, 175791115887829825909515376359375] |