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| n | a(n) |
|---|---|
| 2 | 10 |
| 3 | 67 |
| 4 | 396 |
| 5 | 2201 |
| 6 | 11870 |
| 7 | 62571 |
| 8 | 324896 |
| 9 | 1665349 |
| 10 | 8457890 |
| 11 | 42605267 |
| 12 | 213305636 |
| 13 | 1061939193 |
| 14 | 5263752278 |
| 15 | 25984214383 |
| 16 | 127848694424 |
| 17 | 627084275649 |
| 18 | 3067923454498 |
[10,67,396,2201,11870,62571,324896,1665349, 8457890,42605267,213305636,1061939193,5263752278, 25984214383,127848694424,627084275649, 3067923454498] |