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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 192 |
| 5 | 5120 |
| 6 | 245760 |
| 7 | 22020096 |
| 8 | 3758096384 |
| 9 | 1236950581248 |
| 10 | 791648371998720 |
| 11 | 990791918021509120 |
| 12 | 2434970217729660813312 |
| 13 | 11787026741242634453385216 |
| 14 | 112652543574969605015820304384 |
[0,1,12,192,5120,245760,22020096,3758096384, 1236950581248,791648371998720,990791918021509120, 2434970217729660813312,11787026741242634453385216, 112652543574969605015820304384] |