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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 552 |
| 2 | 63756 |
| 3 | 2704064 |
| 4 | 53183682 |
| 5 | 567173376 |
| 6 | 3844954344 |
| 7 | 19344711936 |
| 8 | 78707396790 |
| 9 | 270865553048 |
| 10 | 819741312720 |
| 11 | 2227781467584 |
| 12 | 5559628500716 |
| 13 | 12871144053504 |
| 14 | 28053560345184 |
| 15 | 57835101053184 |
| 16 | 114001594899018 |
[1,552,63756,2704064,53183682,567173376, 3844954344,19344711936,78707396790,270865553048, 819741312720,2227781467584,5559628500716, 12871144053504,28053560345184,57835101053184, 114001594899018] |