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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 18 |
| 4 | 192 |
| 5 | 2520 |
| 6 | 39600 |
| 7 | 725760 |
| 8 | 15200640 |
| 9 | 358162560 |
| 10 | 9376819200 |
| 11 | 270037152000 |
| 12 | 8483597337600 |
| 13 | 288734500454400 |
| 14 | 10582834303641600 |
| 15 | 415593298568448000 |
| 16 | 17408598098411520000 |
| 17 | 774797125808369664000 |
[0,1,2,18,192,2520,39600,725760,15200640, 358162560,9376819200,270037152000,8483597337600, 288734500454400,10582834303641600, 415593298568448000,17408598098411520000, 774797125808369664000] |