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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 55 |
| 4 | 601 |
| 5 | 7561 |
| 6 | 116191 |
| 7 | 1999327 |
| 8 | 39267985 |
| 9 | 850964401 |
| 10 | 20332107991 |
| 11 | 527930427751 |
| 12 | 14838001344937 |
| 13 | 447653776595065 |
| 14 | 14440021169407471 |
| 15 | 495398956418435791 |
| 16 | 18012260306904120481 |
| 17 | 691502230924473978337 |
| 18 | 27948692251661337581095 |
| 19 | 1185878351946613955122711 |
[1,1,7,55,601,7561,116191,1999327,39267985, 850964401,20332107991,527930427751,14838001344937, 447653776595065,14440021169407471, 495398956418435791,18012260306904120481, 691502230924473978337,27948692251661337581095, 1185878351946613955122711] |