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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 86 |
| 5 | 760 |
| 6 | 8518 |
| 7 | 116278 |
| 8 | 1911198 |
| 9 | 37063964 |
| 10 | 835779524 |
| 11 | 21626042510 |
| 12 | 635611172160 |
| 13 | 21033034941826 |
| 14 | 777710150809009 |
[1,3,13,86,760,8518,116278,1911198,37063964, 835779524,21626042510,635611172160,21033034941826, 777710150809009] |