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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 302 |
| 4 | 7562 |
| 5 | 253542 |
| 6 | 10685794 |
| 7 | 543309230 |
| 8 | 32378850042 |
| 9 | 2214215333750 |
| 10 | 170939286647570 |
| 11 | 14707184259036414 |
| 12 | 1395561779648175274 |
| 13 | 144795755972202587462 |
| 14 | 16308198003201872476866 |
| 15 | 1981633767850818093910094 |
| 16 | 258406311809937562215099482 |
| 17 | 35994776359231593721760238102 |
[1,2,18,302,7562,253542,10685794,543309230, 32378850042,2214215333750,170939286647570, 14707184259036414,1395561779648175274, 144795755972202587462,16308198003201872476866, 1981633767850818093910094, 258406311809937562215099482, 35994776359231593721760238102] |