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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 69 |
| 5 | 195 |
| 6 | 555 |
| 7 | 1573 |
| 8 | 4457 |
| 9 | 12677 |
| 10 | 36165 |
| 11 | 103323 |
| 12 | 295639 |
| 13 | 847587 |
| 14 | 2434755 |
| 15 | 7006089 |
| 16 | 20193261 |
| 17 | 58296927 |
| 18 | 168567687 |
| 19 | 488155597 |
| 20 | 1415686337 |
| 21 | 4111268669 |
| 22 | 11955274925 |
| 23 | 34808988199 |
| 24 | 101471734355 |
| 25 | 296139036809 |
| 26 | 865204909777 |
| 27 | 2530413173787 |
| 28 | 7407817001559 |
| 29 | 21706686476055 |
| 30 | 63662015359655 |
[1,3,9,25,69,195,555,1573,4457,12677,36165,103323, 295639,847587,2434755,7006089,20193261,58296927, 168567687,488155597,1415686337,4111268669, 11955274925,34808988199,101471734355,296139036809, 865204909777,2530413173787,7407817001559, 21706686476055,63662015359655] |