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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 7 |
| 4 | 34 |
| 5 | 182 |
| 6 | 1107 |
| 7 | 7773 |
| 8 | 62212 |
| 9 | 559948 |
| 10 | 5599525 |
| 11 | 61594835 |
| 12 | 739138086 |
| 13 | 9608795202 |
| 14 | 134523132919 |
| 15 | 2017846993897 |
| 16 | 32285551902472 |
| 17 | 548854382342168 |
| 18 | 9879378882159177 |
| 19 | 187708198761024543 |
| 20 | 3754163975220491050 |
[1,7,34,182,1107,7773,62212,559948,5599525, 61594835,739138086,9608795202,134523132919, 2017846993897,32285551902472,548854382342168, 9879378882159177,187708198761024543, 3754163975220491050] |