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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 65 |
| 4 | 1505 |
| 5 | 51505 |
| 6 | 2354725 |
| 7 | 135258625 |
| 8 | 9373203425 |
| 9 | 761486105825 |
| 10 | 71001537157925 |
| 11 | 7475144493546625 |
| 12 | 877222642396170625 |
| 13 | 113551974107296500625 |
| 14 | 16073867927431440597125 |
| 15 | 2470217878902686107522625 |
| 16 | 409596824402404827033730625 |
| 17 | 72890993386914239524503090625 |
| 18 | 13857243751694786173837746653125 |
[1,1,5,65,1505,51505,2354725,135258625,9373203425, 761486105825,71001537157925,7475144493546625, 877222642396170625,113551974107296500625, 16073867927431440597125,2470217878902686107522625, 409596824402404827033730625, 72890993386914239524503090625, 13857243751694786173837746653125] |