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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 18 |
| 3 | 325 |
| 4 | 9050 |
| 5 | 342004 |
| 6 | 16332659 |
| 7 | 942562092 |
| 8 | 63762184160 |
| 9 | 4945947976997 |
| 10 | 432648272729266 |
| 11 | 42126940392610000 |
| 12 | 4518312124929961241 |
| 13 | 529235540464230162094 |
| 14 | 67213443963719684144890 |
| 15 | 9199173104526838608066833 |
[1,2,18,325,9050,342004,16332659,942562092, 63762184160,4945947976997,432648272729266, 42126940392610000,4518312124929961241, 529235540464230162094,67213443963719684144890, 9199173104526838608066833] |