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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 10 |
| 4 | 740 |
| 5 | 433640 |
| 6 | 2030302480 |
| 7 | 76034827876000 |
| 8 | 22779578222682344000 |
| 9 | 54596862986901017252624000 |
| 10 | 1046838176230046602563156976288000 |
| 11 | 160576277008444677145920980328106246720000 |
[1,1,10,740,433640,2030302480,76034827876000, 22779578222682344000,54596862986901017252624000, 1046838176230046602563156976288000, 160576277008444677145920980328106246720000] |