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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 576 |
| 5 | 2073600 |
| 6 | 498161664000 |
| 7 | 12385682950717440000 |
| 8 | 45484508287062207627264000000 |
| 9 | 33297304775599549535597153400913920000000 |
| 10 | 6298496203530014357849150420174490961843322880000000000 |
| 11 | 387030157006015555733158587399026951851936435957496524308480000000000000 |
[1,1,6,576,2073600,498161664000, 12385682950717440000, 45484508287062207627264000000, 33297304775599549535597153400913920000000, 62984962035300143578491504201744909618433228800000\ 00000, 38703015700601555573315858739902695185193643595749\ 6524308480000000000000] |