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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 104 |
| 3 | 2880 |
| 4 | 71334 |
| 5 | 4228781 |
| 6 | 193309200 |
| 7 | 9557110072 |
| 8 | 471778534219 |
| 9 | 23254989974319 |
| 10 | 1151387446628951 |
| 11 | 56934303336591137 |
| 12 | 2817505489516999198 |
| 13 | 139419988171524739756 |
| 14 | 6899299591626979177626 |
| 15 | 341425278258241925272274 |
[0,104,2880,71334,4228781,193309200,9557110072, 471778534219,23254989974319,1151387446628951, 56934303336591137,2817505489516999198, 139419988171524739756,6899299591626979177626, 341425278258241925272274] |