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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 122 |
| 4 | 3550 |
| 5 | 241442 |
| 6 | 37717630 |
| 7 | 13335960962 |
| 8 | 10540951836670 |
| 9 | 18433038372948482 |
| 10 | 70690969784862799870 |
| 11 | 590117604000940804208642 |
| 12 | 10654668783476237855008899070 |
| 13 | 413773679645643893514443704442882 |
[1,2,10,122,3550,241442,37717630,13335960962, 10540951836670,18433038372948482, 70690969784862799870,590117604000940804208642, 10654668783476237855008899070, 413773679645643893514443704442882] |