n | a(n) |
---|---|
0 | -1 |
1 | -1 |
2 | -1 |
3 | 7 |
4 | 127 |
5 | 1711 |
6 | 23231 |
7 | 334391 |
8 | 5144063 |
9 | 84149983 |
10 | 1446872959 |
11 | 25661798119 |
12 | 454494403199 |
13 | 7489030040207 |
14 | 89680375568447 |
15 | -759618144120809 |
16 | -127049044802971649 |
17 | -7480338932613448769 |
18 | -369274690558092738817 |
19 | -17262533154073740329017 |
[-1,-1,-1,7,127,1711,23231,334391,5144063, 84149983,1446872959,25661798119,454494403199, 7489030040207,89680375568447,-759618144120809, -127049044802971649,-7480338932613448769, -369274690558092738817,-17262533154073740329017] |