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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 17 |
| 5 | 39 |
| 6 | 173 |
| 7 | 3199 |
| 8 | 51175 |
| 9 | 661225 |
| 10 | 13583567 |
| 11 | 722876085 |
| 12 | 45766294357 |
| 13 | 3140059939559 |
| 14 | 313372103740953 |
| 15 | 57398488477811657 |
| 16 | 14396095473760523773 |
[1,1,5,17,39,173,3199,51175,661225,13583567, 722876085,45766294357,3140059939559, 313372103740953,57398488477811657, 14396095473760523773] |