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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 15 |
| 3 | 47 |
| 4 | 149 |
| 5 | 469 |
| 6 | 1477 |
| 7 | 4657 |
| 8 | 14677 |
| 9 | 46251 |
| 10 | 145765 |
| 11 | 459391 |
| 12 | 1447783 |
| 13 | 4562753 |
| 14 | 14379751 |
| 15 | 45318455 |
| 16 | 142823219 |
| 17 | 450114149 |
| 18 | 1418555997 |
| 19 | 4470646047 |
| 20 | 14089451907 |
| 21 | 44403572399 |
| 22 | 139939952691 |
| 23 | 441027361411 |
| 24 | 1389918532165 |
| 25 | 4380393813543 |
| 26 | 13805017716305 |
[1,5,15,47,149,469,1477,4657,14677,46251,145765, 459391,1447783,4562753,14379751,45318455, 142823219,450114149,1418555997,4470646047, 14089451907,44403572399,139939952691,441027361411, 1389918532165,4380393813543,13805017716305] |