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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 226 |
| 4 | 5079 |
| 5 | 151326 |
| 6 | 5611906 |
| 7 | 248995090 |
| 8 | 12862665297 |
| 9 | 758353907422 |
| 10 | 50255751919386 |
| 11 | 3698524145800452 |
| 12 | 299324750430958973 |
| 13 | 26424096787968560864 |
| 14 | 2527130527406877225450 |
| 15 | 260305991718814269022586 |
| 16 | 28732428200125730917353569 |
[1,2,15,226,5079,151326,5611906,248995090, 12862665297,758353907422,50255751919386, 3698524145800452,299324750430958973, 26424096787968560864,2527130527406877225450, 260305991718814269022586, 28732428200125730917353569] |