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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 480 |
| 2 | 43072 |
| 3 | 1535392 |
| 4 | 30171264 |
| 5 | 386224480 |
| 6 | 3568285888 |
| 7 | 25502776608 |
| 8 | 148192248064 |
| 9 | 726504898784 |
| 10 | 3090942003520 |
| 11 | 11666428964000 |
| 12 | 39751306125696 |
| 13 | 123999066493024 |
| 14 | 358175327721920 |
| 15 | 967087327771680 |
| 16 | 2459947867603456 |
| 17 | 5933762681602016 |
| 18 | 13648859698457152 |
[1,480,43072,1535392,30171264,386224480, 3568285888,25502776608,148192248064,726504898784, 3090942003520,11666428964000,39751306125696, 123999066493024,358175327721920,967087327771680, 2459947867603456,5933762681602016, 13648859698457152] |