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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 31 |
| 4 | 143 |
| 5 | 592 |
| 6 | 2744 |
| 7 | 12229 |
| 8 | 57456 |
| 9 | 264057 |
| 10 | 1256093 |
| 11 | 5879718 |
| 12 | 28197652 |
| 13 | 133669170 |
| 14 | 644905881 |
| 15 | 3083604026 |
| 16 | 14947599710 |
| 17 | 71929119914 |
| 18 | 349927981469 |
| 19 | 1692271784234 |
| 20 | 8256265429694 |
| 21 | 40083247037137 |
| 22 | 196017772487033 |
| 23 | 954626961030559 |
| 24 | 4677406983727480 |
| 25 | 22838346385326867 |
| 26 | 112083022388746129 |
[1,2,9,31,143,592,2744,12229,57456,264057,1256093, 5879718,28197652,133669170,644905881,3083604026, 14947599710,71929119914,349927981469, 1692271784234,8256265429694,40083247037137, 196017772487033,954626961030559,4677406983727480, 22838346385326867,112083022388746129] |