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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 45 |
| 4 | 586 |
| 5 | 10024 |
| 6 | 213084 |
| 7 | 5428072 |
| 8 | 161475320 |
| 9 | 5501761488 |
| 10 | 211466328400 |
| 11 | 9057714349672 |
| 12 | 428022643010544 |
| 13 | 22127292215218072 |
| 14 | 1242503403120434168 |
| 15 | 75319473068729478360 |
| 16 | 4902798528238919060224 |
| 17 | 341102498012848479889408 |
[0,1,5,45,586,10024,213084,5428072,161475320, 5501761488,211466328400,9057714349672, 428022643010544,22127292215218072, 1242503403120434168,75319473068729478360, 4902798528238919060224,341102498012848479889408] |