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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 5 |
| 3 | 33 |
| 4 | 105 |
| 5 | 473 |
| 6 | 1785 |
| 7 | 7353 |
| 8 | 28985 |
| 9 | 116793 |
| 10 | 465465 |
| 11 | 1865273 |
| 12 | 7454265 |
| 13 | 29830713 |
| 14 | 119295545 |
| 15 | 477236793 |
| 16 | 1908837945 |
| 17 | 7635570233 |
| 18 | 30541844025 |
| 19 | 122168249913 |
| 20 | 488671252025 |
| 21 | 1954688503353 |
| 22 | 7818747022905 |
| 23 | 31275002072633 |
| 24 | 125099980328505 |
| 25 | 500399977238073 |
| 26 | 2001599797104185 |
| 27 | 8006399412112953 |
| 28 | 32025597201059385 |
[0,3,5,33,105,473,1785,7353,28985,116793,465465, 1865273,7454265,29830713,119295545,477236793, 1908837945,7635570233,30541844025,122168249913, 488671252025,1954688503353,7818747022905, 31275002072633,125099980328505,500399977238073, 2001599797104185,8006399412112953, 32025597201059385] |