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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 17 |
| 4 | 229 |
| 5 | 3105 |
| 6 | 44930 |
| 7 | 674292 |
| 8 | 10217420 |
| 9 | 154980130 |
| 10 | 2350703747 |
| 11 | 35658264301 |
| 12 | 540957030465 |
| 13 | 8206939419403 |
[1,17,229,3105,44930,674292,10217420,154980130, 2350703747,35658264301,540957030465,8206939419403] |