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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 40 |
| 4 | 224 |
| 5 | 1152 |
| 6 | 5632 |
| 7 | 26624 |
| 8 | 122880 |
| 9 | 557056 |
| 10 | 2490368 |
| 11 | 11010048 |
| 12 | 48234496 |
| 13 | 209715200 |
| 14 | 905969664 |
| 15 | 3892314112 |
| 16 | 16642998272 |
| 17 | 70866960384 |
| 18 | 300647710720 |
| 19 | 1271310319616 |
| 20 | 5360119185408 |
| 21 | 22539988369408 |
| 22 | 94557999988736 |
[1,6,40,224,1152,5632,26624,122880,557056,2490368, 11010048,48234496,209715200,905969664,3892314112, 16642998272,70866960384,300647710720, 1271310319616,5360119185408,22539988369408, 94557999988736] |