n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | -1 |
3 | -2 |
4 | -4 |
5 | -8 |
6 | -17 |
7 | -38 |
8 | -88 |
9 | -210 |
10 | -511 |
11 | -1264 |
12 | -3165 |
13 | -8006 |
14 | -20426 |
15 | -52472 |
16 | -135682 |
17 | -352562 |
18 | -920924 |
19 | -2414272 |
20 | -6356565 |
21 | -16782444 |
22 | -44470757 |
23 | -118090648 |
24 | -314580062 |
25 | -839379548 |
26 | -2245969278 |
27 | -6017177104 |
28 | -16161597987 |
[1,0,-1,-2,-4,-8,-17,-38,-88,-210,-511,-1264, -3165,-8006,-20426,-52472,-135682,-352562,-920924, -2414272,-6356565,-16782444,-44470757,-118090648, -314580062,-839379548,-2245969278,-6017177104, -16161597987] |