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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 24 |
| 3 | 900 |
| 4 | 40352 |
| 5 | 1994322 |
| 6 | 104816880 |
| 7 | 5747466920 |
| 8 | 325077729600 |
| 9 | 18826860841119 |
| 10 | 1110900168420264 |
| 11 | 66547088543789532 |
| 12 | 4036419643768799328 |
| 13 | 247405021070280491110 |
| 14 | 15299980644645295780560 |
| 15 | 953473460271200881693560 |
| 16 | 59817824263728235912396224 |
[1,24,900,40352,1994322,104816880,5747466920, 325077729600,18826860841119,1110900168420264, 66547088543789532,4036419643768799328, 247405021070280491110,15299980644645295780560, 953473460271200881693560, 59817824263728235912396224] |