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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 562 |
| 4 | 19974 |
| 5 | 958468 |
| 6 | 58085192 |
| 7 | 4258862844 |
| 8 | 366713780800 |
| 9 | 36281317505040 |
| 10 | 4056212559155664 |
| 11 | 505750435243636944 |
| 12 | 69586186789180895904 |
| 13 | 10473322720889293098624 |
| 14 | 1711744141030969885684320 |
| 15 | 301912919501972279345773920 |
| 16 | 57159241548809543158165770240 |
[1,2,24,562,19974,958468,58085192,4258862844, 366713780800,36281317505040,4056212559155664, 505750435243636944,69586186789180895904, 10473322720889293098624,1711744141030969885684320, 301912919501972279345773920, 57159241548809543158165770240] |