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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 176 |
| 4 | 10746 |
| 5 | 1297704 |
| 6 | 272866980 |
| 7 | 91570835040 |
| 8 | 46034917019280 |
| 9 | 33038572997888640 |
| 10 | 32591683412232799680 |
| 11 | 42861143959833044563200 |
| 12 | 73273310483627217731644800 |
| 13 | 159431451667479363623304936960 |
[1,7,176,10746,1297704,272866980,91570835040, 46034917019280,33038572997888640, 32591683412232799680,42861143959833044563200, 73273310483627217731644800, 159431451667479363623304936960] |