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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 10395 |
| 3 | 3864040 |
| 4 | 4622269345 |
| 5 | 10915151070941 |
| 6 | 40684710729862072 |
| 7 | 211109968702038259993 |
| 8 | 1409438188685787895321841 |
| 9 | 11481253272835564584899247346 |
| 10 | 109898940874611419792791074271620 |
| 11 | 1202306852636261419990922606451803760 |
[1,720,10395,3864040,4622269345,10915151070941, 40684710729862072,211109968702038259993, 1409438188685787895321841, 11481253272835564584899247346, 109898940874611419792791074271620, 1202306852636261419990922606451803760] |