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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 15 |
| 7 | 105 |
| 8 | 952 |
| 9 | 9090 |
| 10 | 95382 |
| 11 | 1087842 |
| 12 | 13434840 |
| 13 | 178777899 |
| 14 | 2551800461 |
| 15 | 38906449491 |
| 16 | 631240265424 |
| 17 | 10861179600740 |
| 18 | 197569486825452 |
| 19 | 3788783963810532 |
| 20 | 76401913920275280 |
| 21 | 1616286241420420437 |
| 22 | 35794282853874086955 |
| 23 | 828206562646486747645 |
[1,15,105,952,9090,95382,1087842,13434840, 178777899,2551800461,38906449491,631240265424, 10861179600740,197569486825452,3788783963810532, 76401913920275280,1616286241420420437, 35794282853874086955,828206562646486747645] |