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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 34 |
| 4 | 144 |
| 5 | 377 |
| 6 | 1597 |
| 7 | 4181 |
| 8 | 17711 |
| 9 | 75025 |
| 10 | 196418 |
| 11 | 832040 |
| 12 | 3524578 |
| 13 | 9227465 |
| 14 | 39088169 |
| 15 | 102334155 |
| 16 | 433494437 |
| 17 | 1836311903 |
| 18 | 4807526976 |
| 19 | 20365011074 |
| 20 | 53316291173 |
| 21 | 225851433717 |
| 22 | 956722026041 |
| 23 | 2504730781961 |
| 24 | 10610209857723 |
[1,3,8,34,144,377,1597,4181,17711,75025,196418, 832040,3524578,9227465,39088169,102334155, 433494437,1836311903,4807526976,20365011074, 53316291173,225851433717,956722026041, 2504730781961,10610209857723] |