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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 11 |
| 4 | 47 |
| 5 | 155 |
| 6 | 579 |
| 7 | 2233 |
| 8 | 8593 |
| 9 | 33469 |
| 10 | 135037 |
| 11 | 537525 |
| 12 | 2178673 |
| 13 | 8924945 |
| 14 | 36519777 |
| 15 | 150647219 |
| 16 | 626290259 |
| 17 | 2602163219 |
| 18 | 10874068199 |
| 19 | 45661251703 |
| 20 | 191802674707 |
| 21 | 808778179043 |
| 22 | 3422465929651 |
| 23 | 14489849379543 |
| 24 | 61521249901323 |
| 25 | 261890744544831 |
| 26 | 1115495062342795 |
| 27 | 4761600058102759 |
[1,1,5,11,47,155,579,2233,8593,33469,135037, 537525,2178673,8924945,36519777,150647219, 626290259,2602163219,10874068199,45661251703, 191802674707,808778179043,3422465929651, 14489849379543,61521249901323,261890744544831, 1115495062342795,4761600058102759] |