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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 105 |
| 5 | 216 |
| 6 | 95095 |
| 7 | 9360 |
| 8 | 2027025 |
| 9 | 3203200 |
| 10 | 5683048371 |
| 11 | 76204800 |
| 12 | 29248404810625 |
| 13 | 11975040000 |
| 14 | 1810763157864375 |
| 15 | 1951364659019776 |
| 16 | 191898783962510625 |
| 17 | 690452066304000 |
| 18 | 241664494761081051034375 |
[1,3,10,105,216,95095,9360,2027025,3203200, 5683048371,76204800,29248404810625,11975040000, 1810763157864375,1951364659019776, 191898783962510625,690452066304000, 241664494761081051034375] |