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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 30 |
| 5 | 750 |
| 6 | 6750 |
| 7 | 4866750 |
| 8 | 535342500 |
| 9 | 1200773227500 |
| 10 | 258166243912500 |
| 11 | 936833924075923912500 |
| 12 | 371923067858141793262500 |
| 13 | 178151744952881559857748513262500 |
| 14 | 3567844996171358999271129475108087500 |
| 15 | 3200082237501003827703259262202371164762500 |
[1,2,6,30,750,6750,4866750,535342500, 1200773227500,258166243912500, 936833924075923912500,371923067858141793262500, 178151744952881559857748513262500, 3567844996171358999271129475108087500, 3200082237501003827703259262202371164762500] |