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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 20922 |
| 3 | 96938760190744854628604 |
| 4 | 1039473181175725249030299777705981025900981837012416973957739853576960 |
[1,1,20922,96938760190744854628604, 10394731811757252490302997777059810259009818370124\ 16973957739853576960] |