分数数组开始:
0, -1, -3/2, -11/6, -25/12, -137/60, ...
0, 1, 5/4, 49/36, 205/144, 5269/3600, ...
0, -2, -9/4, -251/108, -2035/864, -256103/108000, ...
0, 6, 51/8, 1393/216, 22369/3456, 14001361/2160000, ...
0, -24, -99/4, -8051/324, -257875/10368, -806108207/32400000, ...
0, 120, 975/8, 237245/1944, 15187325/124416, 47463376609/388800000, ...
...