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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 15 |
| 4 | 274 |
| 5 | 9425 |
| 6 | 527631 |
| 7 | 43806175 |
| 8 | 5060694920 |
| 9 | 776717906529 |
| 10 | 152926864265845 |
| 11 | 37581193509020711 |
| 12 | 11276280009364700628 |
| 13 | 4057223684795928824281 |
| 14 | 1724304353051995724792979 |
[1,2,15,274,9425,527631,43806175,5060694920, 776717906529,152926864265845,37581193509020711, 11276280009364700628,4057223684795928824281, 1724304353051995724792979] |