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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 17 |
| 3 | 442 |
| 4 | 15470 |
| 5 | 680680 |
| 6 | 36076040 |
| 7 | 2236714480 |
| 8 | 158806728080 |
| 9 | 12704538246400 |
| 10 | 1130703903929600 |
| 11 | 110808982585100800 |
| 12 | 11856561136605785600 |
| 13 | 1375361091846271129600 |
| 14 | 171920136480783891200000 |
| 15 | 23037298288425041420800000 |
| 16 | 3294333655244780923174400000 |
| 17 | 500738715597206700322508800000 |
[1,17,442,15470,680680,36076040,2236714480, 158806728080,12704538246400,1130703903929600, 110808982585100800,11856561136605785600, 1375361091846271129600,171920136480783891200000, 23037298288425041420800000, 3294333655244780923174400000, 500738715597206700322508800000] |