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| n | a(n) |
|---|---|
| 1 | 39 |
| 2 | 221 |
| 3 | 1205 |
| 4 | 6467 |
| 5 | 34121 |
| 6 | 177699 |
| 7 | 915213 |
| 8 | 4669391 |
| 9 | 23634429 |
| 10 | 118812727 |
| 11 | 593811441 |
| 12 | 2952974203 |
| 13 | 14621731205 |
| 14 | 72132302495 |
| 15 | 354709008197 |
| 16 | 1739483827823 |
| 17 | 8510158543657 |
| 18 | 41549694953587 |
| 19 | 202504122129701 |
| 20 | 985469127469735 |
[39,221,1205,6467,34121,177699,915213,4669391, 23634429,118812727,593811441,2952974203, 14621731205,72132302495,354709008197, 1739483827823,8510158543657,41549694953587, 202504122129701,985469127469735] |