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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 313 |
| 4 | 4122 |
| 5 | 58584 |
| 6 | 875897 |
| 7 | 13577139 |
| 8 | 216224616 |
| 9 | 3516601243 |
| 10 | 58160887857 |
| 11 | 975211608399 |
| 12 | 16539799297342 |
| 13 | 283243124783136 |
| 14 | 4890858070498203 |
| 15 | 85060240453556192 |
| 16 | 1488653675438168001 |
| 17 | 26197808077514204832 |
| 18 | 463311206395709908936 |
| 19 | 8229849868810254813378 |
[1,3,27,313,4122,58584,875897,13577139,216224616, 3516601243,58160887857,975211608399, 16539799297342,283243124783136,4890858070498203, 85060240453556192,1488653675438168001, 26197808077514204832,463311206395709908936, 8229849868810254813378] |