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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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 136 |
| 7 | 272 |
| 8 | 1360 |
| 9 | 14960 |
| 10 | 254320 |
| 11 | 6103680 |
| 12 | 30518400 |
| 13 | 335702400 |
| 14 | 8056857600 |
| 15 | 499525171200 |
| 16 | 63439696742400 |
| 17 | 1649432115302400 |
| 18 | 94017630572236800 |
| 19 | 5923110726050918400 |
| 20 | 1528162567321136947200 |
| 21 | 385096966964926510694400 |
| 22 | 93963659939442068609433600 |
[1,1,2,4,8,136,272,1360,14960,254320,6103680, 30518400,335702400,8056857600,499525171200, 63439696742400,1649432115302400,94017630572236800, 5923110726050918400,1528162567321136947200, 385096966964926510694400, 93963659939442068609433600] |