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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 105 |
| 4 | 2345 |
| 5 | 69405 |
| 6 | 2559667 |
| 7 | 113073961 |
| 8 | 5820788545 |
| 9 | 342176336073 |
| 10 | 22616620648895 |
| 11 | 1660292619682697 |
| 12 | 134029227728536985 |
| 13 | 11800452870718122325 |
| 14 | 1125324001129006580475 |
| 15 | 115551341953019187183225 |
| 16 | 12711056625162235880359425 |
| 17 | 1491325482312555276046069905 |
[1,1,7,105,2345,69405,2559667,113073961, 5820788545,342176336073,22616620648895, 1660292619682697,134029227728536985, 11800452870718122325,1125324001129006580475, 115551341953019187183225, 12711056625162235880359425, 1491325482312555276046069905] |