n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 4 |
3 | -8 |
4 | 20 |
5 | -44 |
6 | 100 |
7 | -220 |
8 | 484 |
9 | -1052 |
10 | 2276 |
11 | -4892 |
12 | 10468 |
13 | -22300 |
14 | 47332 |
15 | -100124 |
16 | 211172 |
17 | -444188 |
18 | 932068 |
19 | -1951516 |
20 | 4077796 |
21 | -8505116 |
22 | 17709284 |
23 | -36816668 |
24 | 76429540 |
25 | -158451484 |
26 | 328087780 |
27 | -678545180 |
28 | 1401829604 |
[1,-1,4,-8,20,-44,100,-220,484,-1052,2276,-4892, 10468,-22300,47332,-100124,211172,-444188,932068, -1951516,4077796,-8505116,17709284,-36816668, 76429540,-158451484,328087780,-678545180, 1401829604] |