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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 | 2 |
| 3 | 12 |
| 4 | 84 |
| 5 | 720 |
| 6 | 7440 |
| 7 | 90720 |
| 8 | 1280160 |
| 9 | 20563200 |
| 10 | 370863360 |
| 11 | 7424524800 |
| 12 | 163419379200 |
| 13 | 3923023104000 |
| 14 | 102011054745600 |
| 15 | 2856483889459200 |
| 16 | 85697132032512000 |
| 17 | 2742350070620160000 |
| 18 | 93240613775941632000 |
[0,0,2,12,84,720,7440,90720,1280160,20563200, 370863360,7424524800,163419379200,3923023104000, 102011054745600,2856483889459200, 85697132032512000,2742350070620160000, 93240613775941632000] |