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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 729 |
| 5 | 12376 |
| 6 | 250735 |
| 7 | 5904746 |
| 8 | 158210353 |
| 9 | 4747112731 |
| 10 | 157545928646 |
| 11 | 5726207734545 |
| 12 | 226093266070501 |
| 13 | 9632339536696943 |
| 14 | 440262935648935344 |
| 15 | 21482974431740480311 |
| 16 | 1114363790702406540897 |
| 17 | 61219233429920494716931 |
| 18 | 3550130647865299090804375 |
[1,1,5,55,729,12376,250735,5904746,158210353, 4747112731,157545928646,5726207734545, 226093266070501,9632339536696943, 440262935648935344,21482974431740480311, 1114363790702406540897,61219233429920494716931, 3550130647865299090804375] |