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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 14 |
| 2 | 280 |
| 3 | 7280 |
| 4 | 232960 |
| 5 | 8852480 |
| 6 | 389509120 |
| 7 | 19475456000 |
| 8 | 1090625536000 |
| 9 | 67618783232000 |
| 10 | 4598077259776000 |
| 11 | 340257717223424000 |
| 12 | 27220617377873920000 |
| 13 | 2340973094497157120000 |
| 14 | 215369524693738455040000 |
[1,14,280,7280,232960,8852480,389509120, 19475456000,1090625536000,67618783232000, 4598077259776000,340257717223424000, 27220617377873920000,2340973094497157120000, 215369524693738455040000] |