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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 61 |
| 3 | 588 |
| 4 | 4771 |
| 5 | 41762 |
| 6 | 367315 |
| 7 | 3215618 |
| 8 | 28178880 |
| 9 | 246983338 |
| 10 | 2164554841 |
| 11 | 18970525357 |
| 12 | 166262705076 |
| 13 | 1457166433082 |
| 14 | 12770963458496 |
| 15 | 111927910337221 |
| 16 | 980964098035827 |
| 17 | 8597413843575416 |
| 18 | 75349879370232982 |
| 19 | 660385138424897718 |
[2,61,588,4771,41762,367315,3215618,28178880, 246983338,2164554841,18970525357,166262705076, 1457166433082,12770963458496,111927910337221, 980964098035827,8597413843575416, 75349879370232982,660385138424897718] |