n | a(n) |
---|---|
0 | 1 |
1 | -1 |
2 | 0 |
3 | -1 |
4 | -2 |
5 | -6 |
6 | -17 |
7 | -49 |
8 | -141 |
9 | -406 |
10 | -1169 |
11 | -3366 |
12 | -9692 |
13 | -27907 |
14 | -80355 |
15 | -231373 |
16 | -666212 |
17 | -1918281 |
18 | -5523470 |
19 | -15904198 |
20 | -45794313 |
21 | -131859469 |
22 | -379674209 |
23 | -1093228314 |
24 | -3147825473 |
25 | -9063802210 |
26 | -26098178316 |
27 | -75146709475 |
28 | -216376326215 |
29 | -623030800329 |
30 | -1793945691512 |
[1,-1,0,-1,-2,-6,-17,-49,-141,-406,-1169,-3366, -9692,-27907,-80355,-231373,-666212,-1918281, -5523470,-15904198,-45794313,-131859469, -379674209,-1093228314,-3147825473,-9063802210, -26098178316,-75146709475,-216376326215, -623030800329,-1793945691512] |