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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 72 |
| 2 | 2880 |
| 3 | 84480 |
| 4 | 2027520 |
| 5 | 42172416 |
| 6 | 787218432 |
| 7 | 13495173120 |
| 8 | 215922769920 |
| 9 | 3262832967680 |
| 10 | 46984794734592 |
| 11 | 649244436332544 |
| 12 | 8656592484433920 |
| 13 | 111869810568069120 |
| 14 | 1406363332855726080 |
| 15 | 17251390216363573248 |
| 16 | 207016682596362878976 |
| 17 | 2435490383486622105600 |
[1,72,2880,84480,2027520,42172416,787218432, 13495173120,215922769920,3262832967680, 46984794734592,649244436332544,8656592484433920, 111869810568069120,1406363332855726080, 17251390216363573248,207016682596362878976, 2435490383486622105600] |