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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 39 |
| 4 | 249 |
| 5 | 2559 |
| 6 | 32589 |
| 7 | 543099 |
| 8 | 10242789 |
| 9 | 233335659 |
| 10 | 6703028889 |
| 11 | 207263519019 |
| 12 | 7628001653829 |
| 13 | 311878265181039 |
| 14 | 13394639596851069 |
| 15 | 628284422185342479 |
| 16 | 33217442899375387209 |
| 17 | 1955977793053588026279 |
| 18 | 119244359152460559009549 |
| 19 | 7977565910232727614888639 |
[1,3,9,39,249,2559,32589,543099,10242789, 233335659,6703028889,207263519019,7628001653829, 311878265181039,13394639596851069, 628284422185342479,33217442899375387209, 1955977793053588026279,119244359152460559009549, 7977565910232727614888639] |