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| n | a(n) |
|---|---|
| 8 | 57657600 |
| 9 | 6895848960 |
| 10 | 485566099200 |
| 11 | 26364414061440 |
| 12 | 1224007231940640 |
| 13 | 51216101151626880 |
| 14 | 1991943704397427200 |
| 15 | 73440737647137519120 |
| 16 | 2601107886874207253760 |
| 17 | 89332305977055996111040 |
| 18 | 2995343867463073686769440 |
| 19 | 98555316817167057069129600 |
[57657600,6895848960,485566099200,26364414061440, 1224007231940640,51216101151626880, 1991943704397427200,73440737647137519120, 2601107886874207253760,89332305977055996111040, 2995343867463073686769440, 98555316817167057069129600] |