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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 30 |
| 3 | 138 |
| 4 | 17658 |
| 5 | 414138 |
| 6 | 28493946 |
| 7 | 1246334388 |
| 8 | 72638390592 |
| 9 | 3823498828854 |
| 10 | 218021286182580 |
[0,30,138,17658,414138,28493946,1246334388, 72638390592,3823498828854,218021286182580] |