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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 27 |
| 4 | 73 |
| 5 | 195 |
| 6 | 513 |
| 7 | 1347 |
| 8 | 3529 |
| 9 | 9243 |
| 10 | 24201 |
| 11 | 63363 |
| 12 | 165889 |
| 13 | 434307 |
| 14 | 1137033 |
| 15 | 2976795 |
| 16 | 7793353 |
| 17 | 20403267 |
| 18 | 53416449 |
| 19 | 139846083 |
| 20 | 366121801 |
| 21 | 958519323 |
| 22 | 2509436169 |
| 23 | 6569789187 |
| 24 | 17199931393 |
| 25 | 45030004995 |
| 26 | 117890083593 |
| 27 | 308640245787 |
| 28 | 808030653769 |
[1,3,9,27,73,195,513,1347,3529,9243,24201,63363, 165889,434307,1137033,2976795,7793353,20403267, 53416449,139846083,366121801,958519323,2509436169, 6569789187,17199931393,45030004995,117890083593, 308640245787,808030653769] |