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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | 58 |
| 5 | 1069 |
| 6 | 27816 |
| 7 | 943669 |
| 8 | 39757264 |
| 9 | 2010923289 |
| 10 | 119153235520 |
| 11 | 8118839891161 |
| 12 | 627023347399296 |
| 13 | 54258093698028037 |
[1,5,58,1069,27816,943669,39757264,2010923289, 119153235520,8118839891161,627023347399296, 54258093698028037] |