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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 | 0 |
| 3 | 3 |
| 4 | 12 |
| 5 | 120 |
| 6 | 1290 |
| 7 | 17409 |
| 8 | 277592 |
| 9 | 5083659 |
| 10 | 105675030 |
| 11 | 2452220144 |
| 12 | 62891640900 |
| 13 | 1766131052829 |
| 14 | 53900956145218 |
| 15 | 1776400037307315 |
| 16 | 62874491729108656 |
| 17 | 2378684861565934468 |
| 18 | 95790461019732936558 |
[0,1,0,3,12,120,1290,17409,277592,5083659, 105675030,2452220144,62891640900,1766131052829, 53900956145218,1776400037307315,62874491729108656, 2378684861565934468,95790461019732936558] |