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| n | a(n) |
|---|---|
| 1 | 17920 |
| 2 | 80000 |
| 3 | 357600 |
| 4 | 1645856 |
| 5 | 7668960 |
| 6 | 35887648 |
| 7 | 169347520 |
| 8 | 803828768 |
| 9 | 3829693280 |
| 10 | 18318594784 |
| 11 | 87917964800 |
| 12 | 423088386624 |
| 13 | 2041161306400 |
| 14 | 9869739175968 |
| 15 | 47819393840000 |
| 16 | 232117792647904 |
| 17 | 1128649067945600 |
[17920,80000,357600,1645856,7668960,35887648, 169347520,803828768,3829693280,18318594784, 87917964800,423088386624,2041161306400, 9869739175968,47819393840000,232117792647904, 1128649067945600] |