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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 425 |
| 4 | 5605 |
| 5 | 88100 |
| 6 | 1606015 |
| 7 | 33291725 |
| 8 | 773093830 |
| 9 | 19875432575 |
| 10 | 560334083965 |
| 11 | 17187010139150 |
| 12 | 569768238573805 |
| 13 | 20299523526975425 |
| 14 | 773470729977309040 |
| 15 | 31385122689116278325 |
| 16 | 1351135296804805544905 |
| 17 | 61507193821772778512900 |
[1,5,40,425,5605,88100,1606015,33291725,773093830, 19875432575,560334083965,17187010139150, 569768238573805,20299523526975425, 773470729977309040,31385122689116278325, 1351135296804805544905,61507193821772778512900] |