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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 51 |
| 4 | 781 |
| 5 | 16005 |
| 6 | 411881 |
| 7 | 12776743 |
| 8 | 464278585 |
| 9 | 19350109449 |
| 10 | 910126036909 |
| 11 | 47694593157211 |
| 12 | 2755988277318277 |
| 13 | 174100457124362509 |
| 14 | 11937317942278298961 |
| 15 | 882942450221936166735 |
| 16 | 70077737629245663437041 |
| 17 | 5940877531422707027770385 |
[1,1,5,51,781,16005,411881,12776743,464278585, 19350109449,910126036909,47694593157211, 2755988277318277,174100457124362509, 11937317942278298961,882942450221936166735, 70077737629245663437041,5940877531422707027770385] |