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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 8 |
| 3 | 66 |
| 4 | 444 |
| 5 | 2710 |
| 6 | 15512 |
| 7 | 84756 |
| 8 | 446952 |
| 9 | 2291718 |
| 10 | 11485760 |
| 11 | 56486716 |
| 12 | 273405288 |
| 13 | 1305401916 |
| 14 | 6159651344 |
| 15 | 28766573800 |
| 16 | 133128274320 |
| 17 | 611143639110 |
| 18 | 2785335811920 |
| 19 | 12612104460780 |
| 20 | 56773091159400 |
[0,8,66,444,2710,15512,84756,446952,2291718, 11485760,56486716,273405288,1305401916,6159651344, 28766573800,133128274320,611143639110, 2785335811920,12612104460780,56773091159400] |