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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 67 |
| 4 | 1769 |
| 5 | 62499 |
| 6 | 2718712 |
| 7 | 139232874 |
| 8 | 8166885453 |
| 9 | 538622419492 |
| 10 | 39414368809017 |
| 11 | 3167946276763685 |
| 12 | 277436199521729856 |
| 13 | 26298695327956996229 |
| 14 | 2683220559729561789860 |
| 15 | 293242531673596767855914 |
| 16 | 34182433657089947169431226 |
| 17 | 4234005174244450641927919376 |
[1,1,4,67,1769,62499,2718712,139232874,8166885453, 538622419492,39414368809017,3167946276763685, 277436199521729856,26298695327956996229, 2683220559729561789860,293242531673596767855914, 34182433657089947169431226, 4234005174244450641927919376] |