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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 18 |
| 3 | 86400 |
| 4 | 548674560000 |
| 5 | 14450101093977292800000 |
| 6 | 3837346984091658732083085312000000000 |
| 7 | 21256593329287301582222798129123366786826240000000000000 |
| 8 | 4543629380532096097361509541360459283717770305881596724510720000000000000000000 |
[1,1,18,86400,548674560000, 14450101093977292800000, 3837346984091658732083085312000000000, 21256593329287301582222798129123366786826240000000\ 000000, 45436293805320960973615095413604592837177703058815\ 96724510720000000000000000000] |