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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 34 |
| 4 | 631 |
| 5 | 16871 |
| 6 | 617356 |
| 7 | 28968990 |
| 8 | 1680536159 |
| 9 | 117572734195 |
| 10 | 9715771690081 |
| 11 | 932711356031016 |
| 12 | 102653506699902874 |
| 13 | 12810868034079756421 |
| 14 | 1795954763065584594656 |
| 15 | 280569433733767673934426 |
| 16 | 48506369621902094002862671 |
| 17 | 9224242346164172284054561019 |
[1,1,3,34,631,16871,617356,28968990,1680536159, 117572734195,9715771690081,932711356031016, 102653506699902874,12810868034079756421, 1795954763065584594656,280569433733767673934426, 48506369621902094002862671, 9224242346164172284054561019] |