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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 160 |
| 4 | 4381 |
| 5 | 162816 |
| 6 | 7663669 |
| 7 | 437164288 |
| 8 | 29317265625 |
| 9 | 2260685099008 |
| 10 | 197088986941921 |
| 11 | 19170218777296896 |
| 12 | 2058199476739788661 |
| 13 | 241779221463040000000 |
| 14 | 30847476924400409437389 |
| 15 | 4247859315849037948911616 |
| 16 | 627960846411135123552180529 |
[1,1,9,160,4381,162816,7663669,437164288, 29317265625,2260685099008,197088986941921, 19170218777296896,2058199476739788661, 241779221463040000000,30847476924400409437389, 4247859315849037948911616, 627960846411135123552180529] |