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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 60 |
| 4 | 875 |
| 5 | 14600 |
| 6 | 303814 |
| 7 | 6846180 |
| 8 | 165740155 |
| 9 | 4221248540 |
| 10 | 112001557620 |
| 11 | 3071766596524 |
| 12 | 86596464513410 |
| 13 | 2498536503831640 |
| 14 | 73533104142072810 |
| 15 | 2201538635362482480 |
| 16 | 66907117946947479163 |
| 17 | 2060374053699504740000 |
[1,10,60,875,14600,303814,6846180,165740155, 4221248540,112001557620,3071766596524, 86596464513410,2498536503831640,73533104142072810, 2201538635362482480,66907117946947479163, 2060374053699504740000] |