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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 55 |
| 3 | 2999 |
| 4 | 347391 |
| 5 | 69702479 |
| 6 | 22441691645 |
| 7 | 10776262328919 |
| 8 | 7190279422736061 |
| 9 | 6439969796874334809 |
| 10 | 7447188585071730451961 |
[1,3,55,2999,347391,69702479,22441691645, 10776262328919,7190279422736061, 6439969796874334809,7447188585071730451961] |