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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 53 |
| 5 | 171 |
| 6 | 566 |
| 7 | 737 |
| 8 | 4251 |
| 9 | 4988 |
| 10 | 9239 |
| 11 | 41944 |
| 12 | 428679 |
| 13 | 7329487 |
| 14 | 7758166 |
| 15 | 115943811 |
| 16 | 123701977 |
| 17 | 239645788 |
| 18 | 731522646953 |
| 19 | 731762292741 |
| 20 | 1463284939694 |
| 21 | 2195047232435 |
| 22 | 3658332172129 |
| 23 | 5853379404564 |
| 24 | 9511711576693 |
| 25 | 24876802557950 |
| 26 | 59265316692593 |
[1,2,5,12,53,171,566,737,4251,4988,9239,41944, 428679,7329487,7758166,115943811,123701977, 239645788,731522646953,731762292741,1463284939694, 2195047232435,3658332172129,5853379404564, 9511711576693,24876802557950,59265316692593] |