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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 | 1 |
| 3 | 8 |
| 4 | 48 |
| 5 | 312 |
| 6 | 2280 |
| 7 | 18720 |
| 8 | 171360 |
| 9 | 1733760 |
| 10 | 19232640 |
| 11 | 232243200 |
| 12 | 3033676800 |
| 13 | 42631142400 |
| 14 | 641383142400 |
| 15 | 10287038361600 |
| 16 | 175228365312000 |
| 17 | 3159341273088000 |
| 18 | 60111175348224000 |
| 19 | 1203646256676864000 |
| 20 | 25302180885037056000 |
| 21 | 557134559872450560000 |
| 22 | 12823826485099069440000 |
[1,1,1,8,48,312,2280,18720,171360,1733760, 19232640,232243200,3033676800,42631142400, 641383142400,10287038361600,175228365312000, 3159341273088000,60111175348224000, 1203646256676864000,25302180885037056000, 557134559872450560000,12823826485099069440000] |