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a_n=a_1+2(n-1)=1+2(n-1)=2n-1
\alpha=\beta
\sum_{k=1}^n(k-\frac{1}{2})
x^2-px-q=0
a_n=a_1\sum_{k=0}^{n-1}\alpha^{n-1}-\alpha^2a_0\sum_{k=0}^{n-2}\alpha^{n-2}=na_1\alpha^{n-1}-(n-1)a_0\alpha^n