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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 480 |
| 2 | 61920 |
| 3 | 1050240 |
| 4 | 7926240 |
| 5 | 37500480 |
| 6 | 135480960 |
| 7 | 395301120 |
| 8 | 1014559200 |
| 9 | 2296875360 |
| 10 | 4837561920 |
| 11 | 9353842560 |
| 12 | 17342613120 |
| 13 | 30119288640 |
| 14 | 50993844480 |
| 15 | 82051050240 |
| 16 | 129863578080 |
| 17 | 196962563520 |
[1,480,61920,1050240,7926240,37500480,135480960, 395301120,1014559200,2296875360,4837561920, 9353842560,17342613120,30119288640,50993844480, 82051050240,129863578080,196962563520] |