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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 28 |
| 4 | 496 |
| 5 | 1631432881 |
| 6 | 0 |
| 7 | 8256 |
| 8 | 2016 |
| 9 | 41616 |
| 10 | 0 |
| 11 | 169878528 |
| 12 | 2717872128 |
| 13 | 0 |
[1,0,28,496,1631432881,0,8256,2016,41616,0, 169878528,2717872128,0] |