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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 23 |
| 3 | 162 |
| 4 | 1338 |
| 5 | 10585 |
| 6 | 82694 |
| 7 | 612700 |
| 8 | 4337251 |
| 9 | 29267424 |
| 10 | 189156449 |
| 11 | 1174258396 |
| 12 | 7027652401 |
| 13 | 40665520091 |
| 14 | 228144483468 |
| 15 | 1243885610116 |
| 16 | 6604645458105 |
| 17 | 34214740832064 |
| 18 | 173212883196153 |
| 19 | 858180731755508 |
| 20 | 4166502761618085 |
| 21 | 19845587224548144 |
| 22 | 92834956645809855 |
| 23 | 426901317803272329 |
[1,3,23,162,1338,10585,82694,612700,4337251, 29267424,189156449,1174258396,7027652401, 40665520091,228144483468,1243885610116, 6604645458105,34214740832064,173212883196153, 858180731755508,4166502761618085, 19845587224548144,92834956645809855, 426901317803272329] |