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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 19 |
| 3 | 642 |
| 4 | 52046 |
| 5 | 8012520 |
| 6 | 1939769432 |
| 7 | 718866359440 |
| 8 | 368802888131376 |
| 9 | 259389489641608736 |
| 10 | 238655237778415792704 |
| 11 | 270892331023142039759488 |
| 12 | 377446142834845276550334720 |
| 13 | 626883335555480085495326908416 |
| 14 | 1230454868521341442901679438859264 |
[1,2,19,642,52046,8012520,1939769432,718866359440, 368802888131376,259389489641608736, 238655237778415792704,270892331023142039759488, 377446142834845276550334720, 626883335555480085495326908416, 1230454868521341442901679438859264] |