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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 32 |
| 2 | 576 |
| 3 | 7680 |
| 4 | 84480 |
| 5 | 811008 |
| 6 | 7028736 |
| 7 | 56229888 |
| 8 | 421724160 |
| 9 | 2998927360 |
| 10 | 20392706048 |
| 11 | 133479530496 |
| 12 | 845370359808 |
| 13 | 5202279137280 |
| 14 | 31213674823680 |
| 15 | 183120225632256 |
| 16 | 1052941297385472 |
| 17 | 5946021444059136 |
| 18 | 33033452466995200 |
| 19 | 180814687187763200 |
| 20 | 976399310813921280 |
[1,32,576,7680,84480,811008,7028736,56229888, 421724160,2998927360,20392706048,133479530496, 845370359808,5202279137280,31213674823680, 183120225632256,1052941297385472,5946021444059136, 33033452466995200,180814687187763200, 976399310813921280] |