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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 55 |
| 3 | 481 |
| 4 | 5594 |
| 5 | 121029 |
| 6 | 2045306 |
| 7 | 33026298 |
| 8 | 562735444 |
| 9 | 9532097947 |
| 10 | 160132082576 |
| 11 | 2699812308573 |
| 12 | 45545430005680 |
| 13 | 767636583946670 |
| 14 | 12939677383177473 |
| 15 | 218153972376875945 |
| 16 | 3677676423588950515 |
| 17 | 61997693315879549117 |
[1,55,481,5594,121029,2045306,33026298,562735444, 9532097947,160132082576,2699812308573, 45545430005680,767636583946670,12939677383177473, 218153972376875945,3677676423588950515, 61997693315879549117] |