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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 41 |
| 4 | 465 |
| 5 | 6729 |
| 6 | 118437 |
| 7 | 2455809 |
| 8 | 58630401 |
| 9 | 1584058161 |
| 10 | 47783202213 |
| 11 | 1591924168185 |
| 12 | 58055219617425 |
| 13 | 2300356943749305 |
| 14 | 98409722434170885 |
| 15 | 4520749198158270225 |
| 16 | 221954573405993807745 |
| 17 | 11598560660172502840545 |
| 18 | 642753897983638032821445 |
[1,1,5,41,465,6729,118437,2455809,58630401, 1584058161,47783202213,1591924168185, 58055219617425,2300356943749305,98409722434170885, 4520749198158270225,221954573405993807745, 11598560660172502840545,642753897983638032821445] |