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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 | 0 |
| 2 | 1 |
| 3 | 9 |
| 4 | 78 |
| 5 | 750 |
| 6 | 8220 |
| 7 | 102900 |
| 8 | 1463280 |
| 9 | 23451120 |
| 10 | 419942880 |
| 11 | 8331634080 |
| 12 | 181689298560 |
| 13 | 4323472433280 |
| 14 | 111534141438720 |
| 15 | 3101254066310400 |
| 16 | 92468631077222400 |
| 17 | 2943141763622860800 |
| 18 | 99596858633182310400 |
| 19 | 3570677764371119001600 |
| 20 | 135190500045467682816000 |
[0,0,1,9,78,750,8220,102900,1463280,23451120, 419942880,8331634080,181689298560,4323472433280, 111534141438720,3101254066310400, 92468631077222400,2943141763622860800, 99596858633182310400,3570677764371119001600, 135190500045467682816000] |