Given your formula,
$$
\omega_n=\frac{n\pi^{n/2}}{\Gamma(n/2+1)}
$$
a constant which depends only on the dimension of the ball and comes from the formula for the surface area of the n ball with radius $r$
$$
\frac{n\pi^{n/2}}{\Gamma(n/2+1)}r^{n-1}
$$
Related Questions in PARTIAL-DIFFERENTIAL-EQUATIONS
Given your formula, $$ \omega_n=\frac{n\pi^{n/2}}{\Gamma(n/2+1)} $$ a constant which depends only on the dimension of the ball and comes from the formula for the surface area of the n ball with radius $r$ $$ \frac{n\pi^{n/2}}{\Gamma(n/2+1)}r^{n-1} $$