自动求出不同阶有限差分的各个差分系数，用于设计有限差分方案-Automatically find all the different order differential coefficient of finite difference, finite difference scheme for the design

有限差分法构造差分格式，输入基架点个数，输出各点前的系数(The finite difference method constructs the difference scheme, inputs the number of base points and outputs the coefficients before each point.)