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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 | 1 |
| 2 | 6 |
| 3 | 18 |
| 4 | 168 |
| 5 | 840 |
| 6 | 10800 |
| 7 | 75600 |
| 8 | 1249920 |
| 9 | 11249280 |
| 10 | 228614400 |
| 11 | 2514758400 |
| 12 | 60833203200 |
| 13 | 790831641600 |
| 14 | 22230464256000 |
| 15 | 333456963840000 |
| 16 | 10691545632768000 |
| 17 | 181756275757056000 |
| 18 | 6549628300959744000 |
[1,1,6,18,168,840,10800,75600,1249920,11249280, 228614400,2514758400,60833203200,790831641600, 22230464256000,333456963840000,10691545632768000, 181756275757056000,6549628300959744000] |