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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 | 0 |
| 3 | 4 |
| 4 | 68 |
| 5 | 376 |
| 6 | 1440 |
| 7 | 4736 |
| 8 | 14272 |
| 9 | 40576 |
| 10 | 110592 |
| 11 | 291840 |
| 12 | 750592 |
| 13 | 1890304 |
| 14 | 4677632 |
| 15 | 11403264 |
| 16 | 27443200 |
| 17 | 65306624 |
| 18 | 153878528 |
| 19 | 359399424 |
| 20 | 832831488 |
| 21 | 1916272640 |
| 22 | 4380950528 |
| 23 | 9957277696 |
| 24 | 22510829568 |
| 25 | 50642026496 |
| 26 | 113413980160 |
[0,0,0,4,68,376,1440,4736,14272,40576,110592, 291840,750592,1890304,4677632,11403264,27443200, 65306624,153878528,359399424,832831488,1916272640, 4380950528,9957277696,22510829568,50642026496, 113413980160] |