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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 95 |
| 5 | 363 |
| 6 | 1595 |
| 7 | 6576 |
| 8 | 29823 |
| 9 | 128653 |
| 10 | 594848 |
| 11 | 2643155 |
| 12 | 12382129 |
| 13 | 56166303 |
| 14 | 265615561 |
| 15 | 1223207904 |
| 16 | 5826063531 |
| 17 | 27140199774 |
| 18 | 129988229863 |
| 19 | 611007235665 |
| 20 | 2939491293862 |
| 21 | 13916822157388 |
| 22 | 67196819253906 |
| 23 | 320011994648987 |
| 24 | 1549860867957872 |
| 25 | 7416911624118614 |
| 26 | 36013311730046117 |
| 27 | 173048536770924741 |
[1,2,7,23,95,363,1595,6576,29823,128653,594848, 2643155,12382129,56166303,265615561,1223207904, 5826063531,27140199774,129988229863,611007235665, 2939491293862,13916822157388,67196819253906, 320011994648987,1549860867957872,7416911624118614, 36013311730046117,173048536770924741] |