n | a(n) |
---|---|
3 | 1 |
4 | 9 |
5 | 132 |
6 | 2700 |
7 | 70920 |
8 | 2275560 |
9 | 86264640 |
10 | 3772681920 |
11 | 186972105600 |
12 | 10355595465600 |
13 | 633892275878400 |
14 | 42495895579737600 |
15 | 3096545573029708800 |
16 | 243680880958010496000 |
17 | 20596410256606119936000 |
18 | 1860881636529774802944000 |
19 | 178975197401013144907776000 |
20 | 18256461815785805072068608000 |
[1,9,132,2700,70920,2275560,86264640,3772681920, 186972105600,10355595465600,633892275878400, 42495895579737600,3096545573029708800, 243680880958010496000,20596410256606119936000, 1860881636529774802944000, 178975197401013144907776000, 18256461815785805072068608000] |