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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 31 |
| 4 | 130 |
| 5 | 562 |
| 6 | 2504 |
| 7 | 11349 |
| 8 | 52133 |
| 9 | 242147 |
| 10 | 1134569 |
| 11 | 5349564 |
| 12 | 25364039 |
| 13 | 120833817 |
| 14 | 577944794 |
| 15 | 2773523513 |
| 16 | 13349920977 |
| 17 | 64426566906 |
| 18 | 311621092011 |
| 19 | 1510283142011 |
| 20 | 7332950131233 |
| 21 | 35661675760230 |
| 22 | 173681079039219 |
| 23 | 846987755340579 |
| 24 | 4135471231344979 |
| 25 | 20213711486229043 |
| 26 | 98900945363007922 |
[1,2,8,31,130,562,2504,11349,52133,242147,1134569, 5349564,25364039,120833817,577944794,2773523513, 13349920977,64426566906,311621092011, 1510283142011,7332950131233,35661675760230, 173681079039219,846987755340579,4135471231344979, 20213711486229043,98900945363007922] |