$\displaystyle

\lim _{x->\infty}\frac{1^2+3^2+..+(2n-1)^2}{2^2+4^2+..+(2n)^2}

$

i wanted to make a total sum of each series but there is no constant gap

between two members 1 4 9 ..

i cant make an expression of a sum

for the numerator and denominator

??