n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | -1 |
4 | -7 |
5 | -15 |
6 | 25 |
7 | 359 |
8 | 1297 |
9 | 3713 |
10 | 785 |
11 | 347151 |
12 | 3237577 |
13 | 62839153 |
14 | 476552297 |
15 | 10196506423 |
16 | 93536269473 |
17 | 2397571040897 |
18 | 25410713978785 |
19 | 714196911010335 |
20 | 8498142387238425 |
21 | 263318643848985457 |
[1,1,1,-1,-7,-15,25,359,1297,3713,785,347151, 3237577,62839153,476552297,10196506423, 93536269473,2397571040897,25410713978785, 714196911010335,8498142387238425, 263318643848985457] |