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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 45 |
| 2 | 1680 |
| 3 | 62790 |
| 4 | 2471175 |
| 5 | 104085135 |
| 6 | 4712781150 |
| 7 | 229345716600 |
| 8 | 11970744110325 |
| 9 | 668241679730625 |
| 10 | 39773331191493900 |
| 11 | 2516317288024790250 |
| 12 | 168723807382851595875 |
| 13 | 11956978164372003637875 |
| 14 | 893260022082269487896250 |
| 15 | 70178395183380972653665500 |
[1,45,1680,62790,2471175,104085135,4712781150, 229345716600,11970744110325,668241679730625, 39773331191493900,2516317288024790250, 168723807382851595875,11956978164372003637875, 893260022082269487896250, 70178395183380972653665500] |