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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 1 |
| 4 | 17 |
| 5 | 348 |
| 6 | 8640 |
| 7 | 254800 |
| 8 | 8749056 |
| 9 | 343901376 |
| 10 | 15257600000 |
| 11 | 755110160640 |
| 12 | 41278242816000 |
| 13 | 2471677136321536 |
| 14 | 160961785787056128 |
| 15 | 11330322120000000000 |
| 16 | 857485369051342438400 |
| 17 | 69444841895469240729600 |
| 18 | 5993559601317659925282816 |
| 19 | 549242871950650346384195584 |
[0,1,17,348,8640,254800,8749056,343901376, 15257600000,755110160640,41278242816000, 2471677136321536,160961785787056128, 11330322120000000000,857485369051342438400, 69444841895469240729600,5993559601317659925282816, 549242871950650346384195584] |