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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 55 |
| 4 | 5892 |
| 5 | 2081181 |
| 6 | 2353015360 |
| 7 | 8533282805517 |
| 8 | 99227545384370981 |
| 9 | 3699909251614783425693 |
| 10 | 442375363534050667939662012 |
| 11 | 169602369911112134429648742314656 |
[1,2,55,5892,2081181,2353015360,8533282805517, 99227545384370981,3699909251614783425693, 442375363534050667939662012, 169602369911112134429648742314656] |