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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 230 |
| 4 | 4704 |
| 5 | 124388 |
| 6 | 4029888 |
| 7 | 154462924 |
| 8 | 6834212520 |
| 9 | 342732052968 |
| 10 | 19208758459008 |
| 11 | 1189732051180016 |
| 12 | 80692431912452864 |
| 13 | 5947714658316493728 |
| 14 | 473385135814528562176 |
| 15 | 40461455930940173038416 |
[1,2,16,230,4704,124388,4029888,154462924, 6834212520,342732052968,19208758459008, 1189732051180016,80692431912452864, 5947714658316493728,473385135814528562176, 40461455930940173038416] |