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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 425 |
| 5 | 6025 |
| 6 | 108845 |
| 7 | 2276845 |
| 8 | 56211665 |
| 9 | 1553431825 |
| 10 | 48671578325 |
| 11 | 1671344339125 |
| 12 | 63487049154425 |
| 13 | 2605215049488025 |
| 14 | 116312045129808125 |
| 15 | 5551198271938496125 |
| 16 | 284832252600860446625 |
| 17 | 15499152225618045102625 |
| 18 | 898593034796320550409125 |
| 19 | 54905004222557008682573125 |
[1,1,5,37,425,6025,108845,2276845,56211665, 1553431825,48671578325,1671344339125, 63487049154425,2605215049488025, 116312045129808125,5551198271938496125, 284832252600860446625,15499152225618045102625, 898593034796320550409125, 54905004222557008682573125] |