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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 28 |
| 3 | 88 |
| 4 | 277 |
| 5 | 872 |
| 6 | 2746 |
| 7 | 8648 |
| 8 | 27236 |
| 9 | 85778 |
| 10 | 270153 |
| 11 | 850832 |
| 12 | 2679649 |
| 13 | 8439409 |
| 14 | 26579461 |
| 15 | 83710572 |
| 16 | 263641910 |
| 17 | 830325909 |
| 18 | 2615066456 |
| 19 | 8236010096 |
| 20 | 25938867499 |
| 21 | 81693057596 |
| 22 | 257287858063 |
| 23 | 810314166891 |
| 24 | 2552040558803 |
| 25 | 8037513448351 |
| 26 | 25313713063685 |
| 27 | 79724167578475 |
[3,9,28,88,277,872,2746,8648,27236,85778,270153, 850832,2679649,8439409,26579461,83710572, 263641910,830325909,2615066456,8236010096, 25938867499,81693057596,257287858063,810314166891, 2552040558803,8037513448351,25313713063685, 79724167578475] |