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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 18 |
| 5 | 90 |
| 6 | 630 |
| 7 | 4410 |
| 8 | 37800 |
| 9 | 340200 |
| 10 | 3515400 |
| 11 | 38669400 |
| 12 | 471517200 |
| 13 | 6129723600 |
| 14 | 86497210800 |
| 15 | 1297458162000 |
| 16 | 20841060240000 |
| 17 | 354298024080000 |
| 18 | 6389869069584000 |
| 19 | 121407512322096000 |
| 20 | 2430526127309280000 |
| 21 | 51041048673494880000 |
| 22 | 1123451899297247520000 |
[1,3,18,90,630,4410,37800,340200,3515400,38669400, 471517200,6129723600,86497210800,1297458162000, 20841060240000,354298024080000,6389869069584000, 121407512322096000,2430526127309280000, 51041048673494880000,1123451899297247520000] |