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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 67 |
| 4 | 1825 |
| 5 | 85661 |
| 6 | 6208861 |
| 7 | 643969495 |
| 8 | 90484635137 |
| 9 | 16538699920825 |
| 10 | 3811890603086101 |
| 11 | 1081079416534448651 |
| 12 | 369888779067183276385 |
| 13 | 150214056908992952336917 |
| 14 | 71424576855634502660684525 |
| 15 | 39304140073887410352909383071 |
[1,1,5,67,1825,85661,6208861,643969495, 90484635137,16538699920825,3811890603086101, 1081079416534448651,369888779067183276385, 150214056908992952336917, 71424576855634502660684525, 39304140073887410352909383071] |