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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 5159780352 |
| 2 | 2641807540224 |
| 3 | 101559956668416 |
| 4 | 1352605460594688 |
| 5 | 10077696000000000 |
| 6 | 51998697814228992 |
| 7 | 208215748530929664 |
| 8 | 692533995824480256 |
| 9 | 1999004627104432128 |
| 10 | 5159780352000000000 |
[0,5159780352,2641807540224,101559956668416, 1352605460594688,10077696000000000, 51998697814228992,208215748530929664, 692533995824480256,1999004627104432128, 5159780352000000000] |