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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 69 |
| 5 | 191 |
| 6 | 531 |
| 7 | 1485 |
| 8 | 4173 |
| 9 | 11779 |
| 10 | 33381 |
| 11 | 94947 |
| 12 | 270979 |
| 13 | 775809 |
| 14 | 2227607 |
| 15 | 6413441 |
| 16 | 18510645 |
| 17 | 53548119 |
| 18 | 155231177 |
| 19 | 450869943 |
| 20 | 1311874981 |
| 21 | 3823307463 |
| 22 | 11159216577 |
| 23 | 32615423715 |
| 24 | 95446283091 |
| 25 | 279639107073 |
| 26 | 820162536291 |
| 27 | 2407847745541 |
| 28 | 7075424461287 |
| 29 | 20808497810757 |
| 30 | 61244466778891 |
[1,3,9,25,69,191,531,1485,4173,11779,33381,94947, 270979,775809,2227607,6413441,18510645,53548119, 155231177,450869943,1311874981,3823307463, 11159216577,32615423715,95446283091,279639107073, 820162536291,2407847745541,7075424461287, 20808497810757,61244466778891] |