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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 24 |
| 3 | 192 |
| 4 | 3384 |
| 5 | 51840 |
| 6 | 911040 |
| 7 | 16369920 |
| 8 | 307009080 |
| 9 | 5902176000 |
| 10 | 116083727424 |
| 11 | 2323941903360 |
| 12 | 47232891389376 |
| 13 | 972252599205888 |
| 14 | 20233078205573376 |
| 15 | 425067670281526272 |
| 16 | 9004456318854367800 |
| 17 | 192148701659269774848 |
[1,0,24,192,3384,51840,911040,16369920,307009080, 5902176000,116083727424,2323941903360, 47232891389376,972252599205888,20233078205573376, 425067670281526272,9004456318854367800, 192148701659269774848] |