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I want to know if there exists a closed formula for sum $A_n(X)=\sum \limits_{i=0}^n X^{i^2}$.
I have found if n$n$ is odd then $(X^n+1)\text{ | } A_n(X)$, but I don't have found a closed formula.
I have found if n is odd then $(X^n+1)\text{ | } A_n(X)$, but I don't have found a closed formula.
I have found if $n$ is odd then $(X^n+1)\text{ | } A_n(X)$, but I don't have found a closed formula.
