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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 75 |
| 4 | 865 |
| 5 | 12483 |
| 6 | 216113 |
| 7 | 4364979 |
| 8 | 100757313 |
| 9 | 2616517443 |
| 10 | 75496735057 |
| 11 | 2396212835283 |
| 12 | 82968104980961 |
| 13 | 3112139513814243 |
| 14 | 125716310807844081 |
| 15 | 5441108944839913587 |
| 16 | 251195548533025953409 |
| 17 | 12321551453507301079683 |
[1,1,9,75,865,12483,216113,4364979,100757313, 2616517443,75496735057,2396212835283, 82968104980961,3112139513814243, 125716310807844081,5441108944839913587, 251195548533025953409,12321551453507301079683] |