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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 37 |
| 5 | 367 |
| 6 | 4463 |
| 7 | 63797 |
| 8 | 1043961 |
| 9 | 19208815 |
| 10 | 392278493 |
| 11 | 8802891869 |
| 12 | 215335062049 |
| 13 | 5704017709585 |
| 14 | 162695460126735 |
| 15 | 4972552233126827 |
| 16 | 162156046298476305 |
| 17 | 5620675413587870585 |
| 18 | 206382551428754263839 |
| 19 | 8003189847508668434429 |
[1,1,1,5,37,367,4463,63797,1043961,19208815, 392278493,8802891869,215335062049,5704017709585, 162695460126735,4972552233126827, 162156046298476305,5620675413587870585, 206382551428754263839,8003189847508668434429] |