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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 65 |
| 4 | 349 |
| 5 | 1189 |
| 6 | 3709 |
| 7 | 4549 |
| 8 | 24425 |
| 9 | 318365 |
| 10 | 1709401 |
| 11 | 5823721 |
| 12 | 18166681 |
| 13 | 22281001 |
| 14 | 119633645 |
| 15 | 1559351705 |
| 16 | 8372645749 |
| 17 | 28524584269 |
| 18 | 88980399829 |
| 19 | 109132338349 |
| 20 | 585965568785 |
| 21 | 7637704332725 |
| 22 | 41009217169201 |
| 23 | 139713407925841 |
[1,5,65,349,1189,3709,4549,24425,318365,1709401, 5823721,18166681,22281001,119633645,1559351705, 8372645749,28524584269,88980399829,109132338349, 585965568785,7637704332725,41009217169201, 139713407925841] |