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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 96 |
| 3 | 768 |
| 4 | 6528 |
| 5 | 49536 |
| 6 | 360960 |
| 7 | 2546304 |
| 8 | 17563392 |
| 9 | 119091072 |
| 10 | 796813824 |
| 11 | 5274483840 |
| 12 | 34608512256 |
| 13 | 225420724608 |
| 14 | 1459142258688 |
| 15 | 9394561013376 |
| 16 | 60205610853120 |
| 17 | 384263133750144 |
| 18 | 2443755614295552 |
| 19 | 15491594556534912 |
[0,96,768,6528,49536,360960,2546304,17563392, 119091072,796813824,5274483840,34608512256, 225420724608,1459142258688,9394561013376, 60205610853120,384263133750144,2443755614295552, 15491594556534912] |