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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 146512 |
| 3 | 8565952 |
| 4 | 196434000 |
| 5 | 2317602912 |
| 6 | 17225174720 |
| 7 | 93710019456 |
| 8 | 407503812688 |
| 9 | 1487330605840 |
| 10 | 4744665673056 |
| 11 | 13523554712640 |
| 12 | 35251061710528 |
| 13 | 84944383084512 |
| 14 | 192127846616960 |
| 15 | 409984044318336 |
| 16 | 834655060080720 |
[1,720,146512,8565952,196434000,2317602912, 17225174720,93710019456,407503812688, 1487330605840,4744665673056,13523554712640, 35251061710528,84944383084512,192127846616960, 409984044318336,834655060080720] |