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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 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 40 |
| 5 | 340 |
| 6 | 3936 |
| 7 | 56714 |
| 8 | 976704 |
| 9 | 19535688 |
| 10 | 444743680 |
| 11 | 11349643822 |
| 12 | 320813048832 |
| 13 | 9947821243100 |
| 14 | 335700998830848 |
| 15 | 12246806941654770 |
| 16 | 480247532548624384 |
| 17 | 20144008859005187344 |
| 18 | 899923326921333301248 |
| 19 | 42658767419625168409814 |
| 20 | 2138475182252830504796160 |
[0,0,2,6,40,340,3936,56714,976704,19535688, 444743680,11349643822,320813048832,9947821243100, 335700998830848,12246806941654770, 480247532548624384,20144008859005187344, 899923326921333301248,42658767419625168409814, 2138475182252830504796160] |