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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 195 |
| 3 | 2355 |
| 4 | 30815 |
| 5 | 406085 |
| 6 | 5368137 |
| 7 | 71010283 |
| 8 | 939514247 |
| 9 | 12431027733 |
| 10 | 164481297235 |
| 11 | 2176344002529 |
| 12 | 28796451350825 |
| 13 | 381022400987113 |
| 14 | 5041526746028345 |
| 15 | 66707344009697885 |
| 16 | 882643292356416807 |
[1,15,195,2355,30815,406085,5368137,71010283, 939514247,12431027733,164481297235,2176344002529, 28796451350825,381022400987113,5041526746028345, 66707344009697885,882643292356416807] |