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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 19 |
| 5 | 305 |
| 6 | 1219 |
| 7 | 19505 |
| 8 | 78019 |
| 9 | 1248305 |
| 10 | 79891519 |
| 11 | 319566077 |
| 12 | 20452228927 |
| 13 | 327235662833 |
| 14 | 1308942651331 |
| 15 | 20943082421297 |
| 16 | 1340357274963007 |
| 17 | 85782865597632449 |
| 18 | 343131462390529795 |
| 19 | 21960413592993906881 |
[1,1,5,19,305,1219,19505,78019,1248305,79891519, 319566077,20452228927,327235662833,1308942651331, 20943082421297,1340357274963007,85782865597632449, 343131462390529795,21960413592993906881] |