\[ \large \frac{\left(1^4 + \frac14\right)\left(3^4 + \frac14\right)\cdots \left((2n-1)^4 + \frac14\right)}{\left(2^4 + \frac14\right)\left(4^4 + \frac14\right)\cdots \left((2n)^4 + \frac14\right)} \]

Given that the expression above can be simplified to \( (an^2+ bn + c)^{-1} \) for constants \(a,b,c\), find \(21(a-b+c) \).

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