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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 31 |
| 4 | 97 |
| 5 | 308 |
| 6 | 969 |
| 7 | 3051 |
| 8 | 9601 |
| 9 | 30210 |
| 10 | 95049 |
| 11 | 299052 |
| 12 | 940897 |
| 13 | 2960313 |
| 14 | 9313929 |
| 15 | 29304086 |
| 16 | 92198401 |
| 17 | 290080547 |
| 18 | 912670089 |
| 19 | 2871501385 |
| 20 | 9034502497 |
| 21 | 28424933309 |
| 22 | 89432354889 |
| 23 | 281377831710 |
| 24 | 885289046401 |
| 25 | 2785353383794 |
| 26 | 8763458109129 |
| 27 | 27572156006234 |
[1,3,9,31,97,308,969,3051,9601,30210,95049,299052, 940897,2960313,9313929,29304086,92198401, 290080547,912670089,2871501385,9034502497, 28424933309,89432354889,281377831710,885289046401, 2785353383794,8763458109129,27572156006234] |