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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 34 |
| 3 | 344 |
| 4 | 3859 |
| 5 | 46240 |
| 6 | 579722 |
| 7 | 7511272 |
| 8 | 99782617 |
| 9 | 1351784792 |
| 10 | 18604380884 |
| 11 | 259395030992 |
| 12 | 3656180724752 |
| 13 | 52011780756632 |
| 14 | 745799171500502 |
| 15 | 10768038899631476 |
| 16 | 156414710103922340 |
| 17 | 2284233700081510820 |
| 18 | 33517461646190624690 |
| 19 | 493917761019513208800 |
[1,4,34,344,3859,46240,579722,7511272,99782617, 1351784792,18604380884,259395030992,3656180724752, 52011780756632,745799171500502,10768038899631476, 156414710103922340,2284233700081510820, 33517461646190624690,493917761019513208800] |