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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 84 |
| 9 | 840 |
| 10 | 9870 |
| 11 | 113652 |
| 12 | 1480248 |
| 13 | 19699680 |
| 14 | 286768482 |
| 15 | 4358914560 |
| 16 | 71096721696 |
| 17 | 1216711960464 |
| 18 | 22116370171896 |
| 19 | 421629228820800 |
| 20 | 8473857766133760 |
| 21 | 178260053918650704 |
| 22 | 3931319749640138856 |
| 23 | 90499126549555707984 |
| 24 | 2174651142277047610176 |
| 25 | 54390059451824183287200 |
[1,7,84,840,9870,113652,1480248,19699680, 286768482,4358914560,71096721696,1216711960464, 22116370171896,421629228820800,8473857766133760, 178260053918650704,3931319749640138856, 90499126549555707984,2174651142277047610176, 54390059451824183287200] |