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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 7 |
| 7 | 129 |
| 8 | 3312 |
| 9 | 134303 |
| 10 | 8594350 |
| 11 | 894307856 |
| 12 | 158323596832 |
[0,0,0,0,1,7,129,3312,134303,8594350,894307856, 158323596832] |