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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 55 |
| 3 | 1866 |
| 4 | 49523 |
| 5 | 1147175 |
| 6 | 24446239 |
| 7 | 492996938 |
| 8 | 9566197039 |
| 9 | 180473841477 |
| 10 | 3333072098404 |
| 11 | 60544351368853 |
| 12 | 1085308194335997 |
| 13 | 19246250384730902 |
| 14 | 338260488991568790 |
| 15 | 5900404989342994004 |
| 16 | 102262917165512555831 |
| 17 | 1762556960555529202081 |
| 18 | 30231974203021095081766 |
| 19 | 516347665987538314322805 |
| 20 | 8785795492453186831736382 |
[1,55,1866,49523,1147175,24446239,492996938, 9566197039,180473841477,3333072098404, 60544351368853,1085308194335997,19246250384730902, 338260488991568790,5900404989342994004, 102262917165512555831,1762556960555529202081, 30231974203021095081766,516347665987538314322805, 8785795492453186831736382] |