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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 509978 |
| 5 | 128706852 |
| 6 | 35145166536 |
| 7 | 8937075346246 |
| 8 | 2294186499807542 |
| 9 | 587879941920096164 |
| 10 | 150672100573449544628 |
| 11 | 38618667880671318212660 |
| 12 | 9898104313860041433700268 |
| 13 | 2536935635060076589332989468 |
[0,0,0,509978,128706852,35145166536,8937075346246, 2294186499807542,587879941920096164, 150672100573449544628,38618667880671318212660, 9898104313860041433700268, 2536935635060076589332989468] |