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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 49 |
| 5 | 301 |
| 6 | 6241 |
| 7 | 74131 |
| 8 | 1722337 |
| 9 | 46346329 |
| 10 | 1090339201 |
| 11 | 48905462431 |
| 12 | 1584330498961 |
| 13 | 81705172522117 |
| 14 | 4191355357015009 |
| 15 | 223743062044497451 |
| 16 | 16563314120270608321 |
| 17 | 1027165911865738200241 |
| 18 | 91346158358120706564097 |
| 19 | 7395168869747626389974839 |
[1,1,1,7,49,301,6241,74131,1722337,46346329, 1090339201,48905462431,1584330498961, 81705172522117,4191355357015009, 223743062044497451,16563314120270608321, 1027165911865738200241,91346158358120706564097, 7395168869747626389974839] |