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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 167 |
| 5 | 1881 |
| 6 | 26655 |
| 7 | 455463 |
| 8 | 9076919 |
| 9 | 206988913 |
| 10 | 5322034793 |
| 11 | 152333571303 |
| 12 | 4804267653047 |
| 13 | 165552509055571 |
| 14 | 6189393910521307 |
| 15 | 249534333735302649 |
| 16 | 10792240521968254999 |
| 17 | 498441903977024442881 |
| 18 | 24484990389453763815201 |
| 19 | 1274755126330942972043679 |
[1,1,3,19,167,1881,26655,455463,9076919,206988913, 5322034793,152333571303,4804267653047, 165552509055571,6189393910521307, 249534333735302649,10792240521968254999, 498441903977024442881,24484990389453763815201, 1274755126330942972043679] |