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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 49 |
| 5 | 3312 |
| 6 | 818235 |
| 7 | 488196032 |
| 8 | 845278581938 |
| 9 | 3889846475035188 |
| 10 | 49699973559580684560 |
[0,1,2,49,3312,818235,488196032,845278581938, 3889846475035188,49699973559580684560] |