Find the coefficient of 1/x in the expansion of (1+x)^{n}(1/x+x)^{n}

If the sum of binomial coefficients of the expansion (2x+1/x)^{n} is equal to 256, then find the term independent of x

^{n}(1/x+x)^{n}

If the sum of binomial coefficients of the expansion (2x+1/x)^{n} is equal to 256, then find the term independent of x