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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 24 |
| 4 | 92 |
| 5 | 363 |
| 6 | 1483 |
| 7 | 6191 |
| 8 | 26077 |
| 9 | 109987 |
| 10 | 462900 |
| 11 | 1941613 |
| 12 | 8115138 |
| 13 | 33805905 |
| 14 | 140413073 |
| 15 | 581694265 |
| 16 | 2404314784 |
| 17 | 9917782935 |
| 18 | 40837958578 |
| 19 | 167889571658 |
| 20 | 689231516287 |
| 21 | 2825851058202 |
| 22 | 11572537702747 |
| 23 | 47342211484912 |
| 24 | 193485587828057 |
| 25 | 790066214186999 |
| 26 | 3223470297388819 |
| 27 | 13141840760544209 |
| 28 | 53540833421980514 |
[1,6,24,92,363,1483,6191,26077,109987,462900, 1941613,8115138,33805905,140413073,581694265, 2404314784,9917782935,40837958578,167889571658, 689231516287,2825851058202,11572537702747, 47342211484912,193485587828057,790066214186999, 3223470297388819,13141840760544209, 53540833421980514] |