n | a(n) |
---|---|
0 | 1 |
1 | 20 |
2 | 112 |
3 | 1088 |
4 | 7936 |
5 | 66560 |
6 | 520192 |
7 | 4210688 |
8 | 33488896 |
9 | 268697600 |
10 | 2146435072 |
11 | 17184063488 |
12 | 137422176256 |
13 | 1099578736640 |
14 | 8795824586752 |
15 | 70369817919488 |
16 | 562945658454016 |
17 | 4503616807239680 |
18 | 36028728299487232 |
19 | 288230651029618688 |
20 | 2305841909702066176 |
21 | 18446748471756062720 |
[1,20,112,1088,7936,66560,520192,4210688,33488896, 268697600,2146435072,17184063488,137422176256, 1099578736640,8795824586752,70369817919488, 562945658454016,4503616807239680, 36028728299487232,288230651029618688, 2305841909702066176,18446748471756062720] |