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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 60 |
| 3 | 257 |
| 4 | 816 |
| 5 | 4082 |
| 6 | 77887 |
| 7 | 258237 |
| 8 | 816512 |
| 9 | 4546060 |
| 10 | 25820081 |
| 11 | 103276578 |
| 12 | 815209584 |
| 13 | 816472087 |
| 14 | 2581876578 |
| 15 | 24834787435 |
| 16 | 258140787487 |
| 17 | 1239623599592 |
| 18 | 7978512779247 |
| 19 | 78515384904912 |
| 20 | 121105886176546 |
| 21 | 816494743559742 |
| 22 | 6608227190863421 |
| 23 | 8164653370882732 |
| 24 | 81281404248860431 |
| 25 | 81649676463937177 |
[2,60,257,816,4082,77887,258237,816512,4546060, 25820081,103276578,815209584,816472087,2581876578, 24834787435,258140787487,1239623599592, 7978512779247,78515384904912,121105886176546, 816494743559742,6608227190863421,8164653370882732, 81281404248860431,81649676463937177] |