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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 255 |
| 3 | 825 |
| 4 | 2817 |
| 5 | 9717 |
| 6 | 34317 |
| 7 | 122305 |
| 8 | 442285 |
| 9 | 1612085 |
| 10 | 5935493 |
| 11 | 21990145 |
| 12 | 82051485 |
| 13 | 307574133 |
| 14 | 1158698629 |
| 15 | 4379531169 |
| 16 | 16610367645 |
| 17 | 63145291189 |
| 18 | 240620562981 |
| 19 | 918393173569 |
| 20 | 3511019670621 |
| 21 | 13437773070709 |
| 22 | 51488379790533 |
[81,255,825,2817,9717,34317,122305,442285,1612085, 5935493,21990145,82051485,307574133,1158698629, 4379531169,16610367645,63145291189,240620562981, 918393173569,3511019670621,13437773070709, 51488379790533] |