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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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 2 |
| 6 | 14 |
| 7 | 84 |
| 8 | 630 |
| 9 | 6096 |
| 10 | 55336 |
| 11 | 672160 |
| 12 | 7409300 |
| 13 | 104999520 |
| 14 | 1366363752 |
| 15 | 22068387264 |
| 16 | 331233939624 |
| 17 | 6005919062528 |
| 18 | 102144359744192 |
| 19 | 2054811316442112 |
| 20 | 39053339674065360 |
| 21 | 863259240785840640 |
| 22 | 18132529836143846560 |
| 23 | 436899062862222484480 |
[1,0,0,0,2,2,14,84,630,6096,55336,672160,7409300, 104999520,1366363752,22068387264,331233939624, 6005919062528,102144359744192,2054811316442112, 39053339674065360,863259240785840640, 18132529836143846560,436899062862222484480] |