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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 94372560 |
| 7 | 5284828080 |
| 8 | 338228714880 |
| 9 | 461220488356944960 |
| 10 | 124524904888012809600 |
| 11 | 36983489578531184304000 |
| 12 | 94262861823240343196388902400 |
| 13 | 78420937396722501660156363686400 |
| 14 | 70262981254649802508019882162611200 |
[1,0,0,6,24,120,94372560,5284828080,338228714880, 461220488356944960,124524904888012809600, 36983489578531184304000, 94262861823240343196388902400, 78420937396722501660156363686400, 70262981254649802508019882162611200] |