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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 48 |
| 3 | 288 |
| 4 | 138240 |
| 5 | 1382400 |
| 6 | 2090188800 |
| 7 | 29262643200 |
| 8 | 56184274944000 |
| 9 | 1011316948992000 |
| 10 | 1334938372669440000 |
| 11 | 29368644198727680000 |
| 12 | 11545401407403825561600000 |
| 13 | 300180436592499464601600000 |
| 14 | 50430313347539910053068800000 |
| 15 | 1512909400426197301592064000000 |
[1,2,48,288,138240,1382400,2090188800,29262643200, 56184274944000,1011316948992000, 1334938372669440000,29368644198727680000, 11545401407403825561600000, 300180436592499464601600000, 50430313347539910053068800000, 1512909400426197301592064000000] |