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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 17 |
| 3 | 561 |
| 4 | 39521 |
| 5 | 4429217 |
| 6 | 749371633 |
| 7 | 176540328017 |
| 8 | 55517224330689 |
| 9 | 22448523976439873 |
| 10 | 11356291769744087761 |
| 11 | 7026618486154627990385 |
| 12 | 5220988665867670545052193 |
| 13 | 4587518335717939527563335649 |
[1,1,17,561,39521,4429217,749371633,176540328017, 55517224330689,22448523976439873, 11356291769744087761,7026618486154627990385, 5220988665867670545052193, 4587518335717939527563335649] |