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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 428 |
| 3 | 5100 |
| 4 | 310804 |
| 5 | 10631552 |
| 6 | 448752816 |
| 7 | 17477913984 |
| 8 | 702369644524 |
| 9 | 27889180833188 |
| 10 | 1112507026382520 |
| 11 | 44300516313730388 |
| 12 | 1765247886383707868 |
| 13 | 70322056553003374268 |
| 14 | 2801688699959758846796 |
| 15 | 111617418686821238798432 |
[0,428,5100,310804,10631552,448752816,17477913984, 702369644524,27889180833188,1112507026382520, 44300516313730388,1765247886383707868, 70322056553003374268,2801688699959758846796, 111617418686821238798432] |