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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 21 |
| 3 | 28800 |
| 4 | 6702928485 |
| 5 | 485036145970949475 |
| 6 | 17284020213927891173772415260 |
| 7 | 439885788765576174397949231373608504971360 |
| 8 | 10926401685584312222862714944076761452123218197332439365413 |
| 9 | 346792877099311752547903589477147000220953930332269111366383185472249165168535 |
[1,1,21,28800,6702928485,485036145970949475, 17284020213927891173772415260, 439885788765576174397949231373608504971360, 10926401685584312222862714944076761452123218197332\ 439365413, 34679287709931175254790358947714700022095393033226\ 9111366383185472249165168535] |