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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 630 |
| 5 | 48670 |
| 6 | 4293525 |
| 7 | 358348053 |
| 8 | 32224041500 |
| 9 | 2966406894648 |
| 10 | 259556693304825 |
| 11 | 20157653282906667 |
| 12 | 1439903350550159550 |
| 13 | 97064374251531230622 |
| 14 | 6271845201623139087495 |
| 15 | 391742584864070048279685 |
[1,9,630,48670,4293525,358348053,32224041500, 2966406894648,259556693304825,20157653282906667, 1439903350550159550,97064374251531230622, 6271845201623139087495,391742584864070048279685] |