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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 91 |
| 3 | 269 |
| 4 | 797 |
| 5 | 2365 |
| 6 | 7025 |
| 7 | 20883 |
| 8 | 62115 |
| 9 | 184845 |
| 10 | 550289 |
| 11 | 1638775 |
| 12 | 4881719 |
| 13 | 14545715 |
| 14 | 43350415 |
| 15 | 129222077 |
| 16 | 385262397 |
| 17 | 1148802957 |
| 18 | 3426077313 |
| 19 | 10218944199 |
| 20 | 30483682935 |
| 21 | 90944672583 |
| 22 | 271351287651 |
| 23 | 809707376697 |
[1,31,91,269,797,2365,7025,20883,62115,184845, 550289,1638775,4881719,14545715,43350415, 129222077,385262397,1148802957,3426077313, 10218944199,30483682935,90944672583,271351287651, 809707376697] |