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| n | a(n) |
|---|---|
| 1 | 218 |
| 2 | 672 |
| 3 | 2766 |
| 4 | 13977 |
| 5 | 49670 |
| 6 | 231636 |
| 7 | 798330 |
| 8 | 3709535 |
| 9 | 12773958 |
| 10 | 59358300 |
| 11 | 204384986 |
| 12 | 949713803 |
| 13 | 3270113366 |
| 14 | 15195208008 |
| 15 | 52321104606 |
| 16 | 243120127107 |
| 17 | 837126587718 |
| 18 | 3889870442680 |
| 19 | 13393847713706 |
| 20 | 62237101136015 |
[218,672,2766,13977,49670,231636,798330,3709535, 12773958,59358300,204384986,949713803,3270113366, 15195208008,52321104606,243120127107,837126587718, 3889870442680,13393847713706,62237101136015] |