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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 6 |
| 3 | 1216 |
| 4 | 2113288 |
| 5 | 20095347085 |
| 6 | 828045453260560 |
| 7 | 122498884159587560730 |
| 8 | 56021411242071401516696320 |
| 9 | 70241609479301663107223809203427 |
| 10 | 218979482042361137186381999071773029400 |
[0,6,1216,2113288,20095347085,828045453260560, 122498884159587560730,56021411242071401516696320, 70241609479301663107223809203427, 218979482042361137186381999071773029400] |