n | a(n) |
---|---|
0 | 1 |
1 | -3 |
2 | 6 |
3 | -15 |
4 | 33 |
5 | -78 |
6 | 177 |
7 | -411 |
8 | 942 |
9 | -2175 |
10 | 5001 |
11 | -11526 |
12 | 26529 |
13 | -61107 |
14 | 140694 |
15 | -324015 |
16 | 746097 |
17 | -1718142 |
18 | 3956433 |
19 | -9110859 |
20 | 20980158 |
21 | -48312735 |
22 | 111253209 |
23 | -256191414 |
24 | 589951041 |
25 | -1358525283 |
26 | 3128378406 |
27 | -7203954255 |
28 | 16589089473 |
[1,-3,6,-15,33,-78,177,-411,942,-2175,5001,-11526, 26529,-61107,140694,-324015,746097,-1718142, 3956433,-9110859,20980158,-48312735,111253209, -256191414,589951041,-1358525283,3128378406, -7203954255,16589089473] |