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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 92 |
| 4 | 4716 |
| 5 | 414716 |
| 6 | 55210372 |
| 7 | 10337500044 |
| 8 | 2587595524492 |
| 9 | 834145695871436 |
| 10 | 336495839997451716 |
| 11 | 166037668496103782012 |
[1,4,92,4716,414716,55210372,10337500044, 2587595524492,834145695871436,336495839997451716, 166037668496103782012] |