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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 247 |
| 3 | 5811 |
| 4 | 159939 |
| 5 | 4993911 |
| 6 | 173345913 |
| 7 | 6593244957 |
| 8 | 271829934441 |
| 9 | 12046090972149 |
| 10 | 569908578269511 |
| 11 | 28625770524756483 |
| 12 | 1519419921487859547 |
| 13 | 84887883112007162511 |
| 14 | 4974828151748224390569 |
| 15 | 304918429757614547396301 |
[1,13,247,5811,159939,4993911,173345913, 6593244957,271829934441,12046090972149, 569908578269511,28625770524756483, 1519419921487859547,84887883112007162511, 4974828151748224390569,304918429757614547396301] |