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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 9 |
| 4 | 96 |
| 5 | 450 |
| 6 | 3132 |
| 7 | 22680 |
| 8 | 179904 |
| 9 | 1578528 |
| 10 | 15282000 |
| 11 | 162304560 |
| 12 | 1879227072 |
| 13 | 23579281440 |
| 14 | 318874800384 |
| 15 | 4625170411680 |
| 16 | 71640771563520 |
| 17 | 1180394962790400 |
| 18 | 20616532017767424 |
| 19 | 380509312545031680 |
| 20 | 7400308896979660800 |
| 21 | 151271976281858611200 |
| 22 | 3242509236999683481600 |
[1,0,6,9,96,450,3132,22680,179904,1578528, 15282000,162304560,1879227072,23579281440, 318874800384,4625170411680,71640771563520, 1180394962790400,20616532017767424, 380509312545031680,7400308896979660800, 151271976281858611200,3242509236999683481600] |