Let K be the number of rational terms in the expansion of $(\sqrt{2}+\sqrt[6]{3})^{6144}$. If the coefficient of $x^P (P \in N)$ in the expansion of $\frac{1}{(1+x)(1+x^2)(1+x^4)(1+x^8)(1+x^{16})}$ is $a_P$, then $a_K - a_{K+1} - a_{K-1} =$
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To simplify products like $(1+x)(1+x^2)\dots$, multiply by $(1-x)$ and use difference of squares repeatedly. This helps find coefficients in generating functions.