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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 162 |
| 5 | 5470 |
| 6 | 204405 |
| 7 | 10044237 |
| 8 | 418371436 |
| 9 | 15735232164 |
| 10 | 556455670755 |
| 11 | 18061671242945 |
| 12 | 536877862194894 |
| 13 | 14910514196745102 |
| 14 | 397858116730316515 |
| 15 | 10322446421549098305 |
| 16 | 260281325962170069480 |
| 17 | 6368185576937692717552 |
[1,3,162,5470,204405,10044237,418371436, 15735232164,556455670755,18061671242945, 536877862194894,14910514196745102, 397858116730316515,10322446421549098305, 260281325962170069480,6368185576937692717552] |