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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5040 |
| 2 | 1781750880 |
| 3 | 1224777388630320 |
| 4 | 1139907455908263095760 |
| 5 | 1261774625300967410997361200 |
| 6 | 1562711749309729990152410055981840 |
| 7 | 2093930745462011336917616846237237197680 |
| 8 | 2973970378870521024883907518445574302750687520 |
[1,5040,1781750880,1224777388630320, 1139907455908263095760, 1261774625300967410997361200, 1562711749309729990152410055981840, 2093930745462011336917616846237237197680, 2973970378870521024883907518445574302750687520] |