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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 3410 |
| 3 | 2330240 |
| 4 | 7549603600 |
| 5 | 118965950703744 |
| 6 | 9309505329218297280 |
| 7 | 3637689729211851543816960 |
| 8 | 7105314552536912564123328420000 |
| 9 | 69388718760088702173445263653542192000 |
[1,30,3410,2330240,7549603600,118965950703744, 9309505329218297280,3637689729211851543816960, 7105314552536912564123328420000, 69388718760088702173445263653542192000] |