n | a(n) |
---|---|
1 | 1 |
2 | -4 |
3 | 21 |
4 | -104 |
5 | 521 |
6 | -2604 |
7 | 13021 |
8 | -65104 |
9 | 325521 |
10 | -1627604 |
11 | 8138021 |
12 | -40690104 |
13 | 203450521 |
14 | -1017252604 |
15 | 5086263021 |
16 | -25431315104 |
17 | 127156575521 |
18 | -635782877604 |
19 | 3178914388021 |
20 | -15894571940104 |
21 | 79472859700521 |
[1,-4,21,-104,521,-2604,13021,-65104,325521, -1627604,8138021,-40690104,203450521,-1017252604, 5086263021,-25431315104,127156575521, -635782877604,3178914388021,-15894571940104, 79472859700521] |