Looking for a grammar to ${w, epsilon left { a, b, c right }^{*} /w= a^ {n} b^ {2n+1} c^ {n} a^ {n-1} ,|,,n $ > $ 1}$

I’ve tried so many times to look for a grammar for this language ${w, epsilon left { a, b, c right }^{*} /w= a^ {n} b^ {2n+1} c^ {n} a^ {n-1} ,|,,n $ > $ 1}$ but I couldn’t find it. Anyone have an idea on how to solve it?