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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 14 |
| 4 | 79 |
| 5 | 446 |
| 6 | 2530 |
| 7 | 14442 |
| 8 | 82913 |
| 9 | 478384 |
| 10 | 2771900 |
| 11 | 16119808 |
| 12 | 94038087 |
| 13 | 550083340 |
| 14 | 3225409094 |
| 15 | 18951732050 |
| 16 | 111562247565 |
| 17 | 657813211278 |
| 18 | 3884461464740 |
| 19 | 22968812720476 |
| 20 | 135978792939818 |
[2,14,79,446,2530,14442,82913,478384,2771900, 16119808,94038087,550083340,3225409094, 18951732050,111562247565,657813211278, 3884461464740,22968812720476,135978792939818] |