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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 17 |
| 3 | 590 |
| 4 | 105824 |
| 5 | 69300688 |
| 6 | 194965719104 |
| 7 | 2426497181267968 |
| 8 | 177803451495373322240 |
| 9 | 52976870608237776911450112 |
| 10 | 110350007913361454793759188320256 |
[2,17,590,105824,69300688,194965719104, 2426497181267968,177803451495373322240, 52976870608237776911450112, 110350007913361454793759188320256] |