关于Mathematica使用的简单问题我要求RSolve[{a[n + 3] == 2/3* a[n] + a[n + 1]/3,a[1] == 2/3,a[2] = 0,a[3] = 2/9},a[n],n]结果RSolve::deqn:Equation or list of equations expected instead of 0 in the first argument {a[1+n]==(2 a[n])/3+1/3 a[1
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