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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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 360 |
| 7 | 2520 |
| 8 | 20160 |
| 9 | 181440 |
| 10 | 907200 |
| 11 | 9979200 |
| 12 | 39916800 |
| 13 | 518918400 |
| 14 | 3632428800 |
| 15 | 18162144000 |
| 16 | 290594304000 |
| 17 | 4940103168000 |
| 18 | 44460928512000 |
| 19 | 844757641728000 |
| 20 | 4223788208640000 |
| 21 | 29566517460480000 |
| 22 | 325231692065280000 |
| 23 | 7480328917501440000 |
| 24 | 59842631340011520000 |
[1,1,2,6,24,120,360,2520,20160,181440,907200, 9979200,39916800,518918400,3632428800,18162144000, 290594304000,4940103168000,44460928512000, 844757641728000,4223788208640000, 29566517460480000,325231692065280000, 7480328917501440000,59842631340011520000] |