| n | a(n) |
|---|---|
| 0 | 9 |
| 1 | 25 |
| 2 | 73 |
| 3 | 217 |
| 4 | 649 |
| 5 | 1945 |
| 6 | 5833 |
| 7 | 17497 |
| 8 | 52489 |
| 9 | 157465 |
| 10 | 472393 |
| 11 | 1417177 |
| 12 | 4251529 |
| 13 | 12754585 |
| 14 | 38263753 |
| 15 | 114791257 |
| 16 | 344373769 |
| 17 | 1033121305 |
| 18 | 3099363913 |
| 19 | 9298091737 |
| 20 | 27894275209 |
| 21 | 83682825625 |
| 22 | 251048476873 |
| 23 | 753145430617 |
| 24 | 2259436291849 |
| 25 | 6778308875545 |
[9,25,73,217,649,1945,5833,17497,52489,157465, 472393,1417177,4251529,12754585,38263753, 114791257,344373769,1033121305,3099363913, 9298091737,27894275209,83682825625,251048476873, 753145430617,2259436291849,6778308875545] |