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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 75 |
| 4 | 784 |
| 5 | 8820 |
| 6 | 104544 |
| 7 | 1288287 |
| 8 | 16359200 |
| 9 | 212751396 |
| 10 | 2821056160 |
| 11 | 38013731756 |
| 12 | 519227905728 |
| 13 | 7174705330000 |
| 14 | 100136810390400 |
| 15 | 1409850293610375 |
| 16 | 20002637245262400 |
| 17 | 285732116760449700 |
| 18 | 4106497099278420000 |
| 19 | 59341164471850545900 |
| 20 | 861753537765219528000 |
[0,1,8,75,784,8820,104544,1288287,16359200, 212751396,2821056160,38013731756,519227905728, 7174705330000,100136810390400,1409850293610375, 20002637245262400,285732116760449700, 4106497099278420000,59341164471850545900, 861753537765219528000] |