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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 3 |
| 4 | 20 |
| 5 | 90 |
| 6 | 594 |
| 7 | 4200 |
| 8 | 34544 |
| 9 | 316008 |
| 10 | 3207240 |
| 11 | 35699400 |
| 12 | 432690312 |
| 13 | 5672581200 |
| 14 | 79991160144 |
| 15 | 1207367605080 |
| 16 | 19423062612480 |
| 17 | 331770360922560 |
| 18 | 5997105160795584 |
| 19 | 114373526841360000 |
| 20 | 2295170834453089920 |
[2,3,20,90,594,4200,34544,316008,3207240,35699400, 432690312,5672581200,79991160144,1207367605080, 19423062612480,331770360922560,5997105160795584, 114373526841360000,2295170834453089920] |