n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | -1 |
3 | -5 |
4 | -17 |
5 | -49 |
6 | -129 |
7 | -305 |
8 | -609 |
9 | -801 |
10 | 735 |
11 | 10911 |
12 | 53983 |
13 | 203551 |
14 | 651487 |
15 | 1796639 |
16 | 4084447 |
17 | 6188831 |
18 | -4060449 |
19 | -84814049 |
20 | -455815457 |
21 | -1824908513 |
22 | -6141218081 |
23 | -17711864033 |
24 | -42059573537 |
25 | -67468774625 |
26 | 33608030943 |
[1,1,-1,-5,-17,-49,-129,-305,-609,-801,735,10911, 53983,203551,651487,1796639,4084447,6188831, -4060449,-84814049,-455815457,-1824908513, -6141218081,-17711864033,-42059573537, -67468774625,33608030943] |