# 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?