n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | -2 |
3 | 8 |
4 | -20 |
5 | 96 |
6 | -324 |
7 | 1648 |
8 | -6348 |
9 | 33200 |
10 | -137848 |
11 | 732640 |
12 | -3193296 |
13 | 17148608 |
14 | -77335400 |
15 | 418289696 |
16 | -1934677436 |
17 | 10518803376 |
18 | -49611450120 |
19 | 270796872160 |
20 | -1297234193744 |
21 | 7102371571840 |
22 | -34458382484976 |
23 | 189117499963840 |
[1,4,-2,8,-20,96,-324,1648,-6348,33200,-137848, 732640,-3193296,17148608,-77335400,418289696, -1934677436,10518803376,-49611450120,270796872160, -1297234193744,7102371571840,-34458382484976, 189117499963840] |