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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 315 |
| 3 | 2471040 |
| 4 | 918185538816 |
| 5 | 16047302734562299200 |
| 6 | 13178031727820369629763174400 |
| 7 | 508406658175888466343652105865846784000 |
| 8 | 921456090985190879093613420564815806955580862464000 |
| 9 | 78458394721620642094151397745899367347021362840662985785265356800 |
[1,2,315,2471040,918185538816, 16047302734562299200, 13178031727820369629763174400, 508406658175888466343652105865846784000, 92145609098519087909361342056481580695558086246400\ 0, 78458394721620642094151397745899367347021362840662\ 985785265356800] |