| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 30 |
| 2 | 480 |
| 3 | 7392 |
| 4 | 110880 |
| 5 | 1633632 |
| 6 | 23761920 |
| 7 | 342328320 |
| 8 | 4895294976 |
| 9 | 69589977600 |
| 10 | 984515051520 |
| 11 | 13872712089600 |
| 12 | 194821130649600 |
| 13 | 2728095278727168 |
| 14 | 38106727702855680 |
| 15 | 531128942672216064 |
[2,30,480,7392,110880,1633632,23761920,342328320, 4895294976,69589977600,984515051520, 13872712089600,194821130649600,2728095278727168, 38106727702855680,531128942672216064] |