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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 19 |
| 3 | 73 |
| 4 | 335 |
| 5 | 1593 |
| 6 | 7669 |
| 7 | 37311 |
| 8 | 184335 |
| 9 | 919889 |
| 10 | 4620477 |
| 11 | 23332387 |
| 12 | 118371541 |
| 13 | 602858159 |
| 14 | 3080279011 |
| 15 | 15782030681 |
| 16 | 81053501795 |
| 17 | 417143999201 |
| 18 | 2150782607289 |
| 19 | 11107401645291 |
| 20 | 57445755808701 |
| 21 | 297487456185331 |
| 22 | 1542374070100235 |
[3,19,73,335,1593,7669,37311,184335,919889, 4620477,23332387,118371541,602858159,3080279011, 15782030681,81053501795,417143999201, 2150782607289,11107401645291,57445755808701, 297487456185331,1542374070100235] |