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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 61 |
| 3 | 845 |
| 4 | 12865 |
| 5 | 206525 |
| 6 | 3434005 |
| 7 | 58542125 |
| 8 | 1016757025 |
| 9 | 17915319125 |
| 10 | 319316172781 |
| 11 | 5744962350605 |
| 12 | 104168557434241 |
| 13 | 1901265562745645 |
| 14 | 34897397882019685 |
| 15 | 643662507367299725 |
| 16 | 11922610595971162945 |
| 17 | 221673143774064873125 |
| 18 | 4135241181985049252125 |
[1,5,61,845,12865,206525,3434005,58542125, 1016757025,17915319125,319316172781,5744962350605, 104168557434241,1901265562745645, 34897397882019685,643662507367299725, 11922610595971162945,221673143774064873125, 4135241181985049252125] |