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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 52 |
| 4 | 389 |
| 5 | 3741 |
| 6 | 49908 |
| 7 | 938799 |
| 8 | 25477165 |
| 9 | 984680146 |
| 10 | 54180019253 |
| 11 | 4211350678751 |
| 12 | 462028240134476 |
| 13 | 71561459522839253 |
| 14 | 15611478225943599423 |
| 15 | 4816139618587302209166 |
| 16 | 2092942812095475521879845 |
[1,1,9,52,389,3741,49908,938799,25477165, 984680146,54180019253,4211350678751, 462028240134476,71561459522839253, 15611478225943599423,4816139618587302209166, 2092942812095475521879845] |