\[{{}_{4}\phi_{3}}\left({q^{-n},aq^{n},c,-c\atop(aq)^{\frac{1}{2}},-(aq)^{\frac{%
1}{2}},c^{2}};q,q\right)=\begin{cases}0,&\mbox{$n$ odd,}\\
\dfrac{c^{n}\left(q,aq/c^{2};q^{2}\right)_{n/2}}{\left(aq,c^{2}q;q^{2}\right)_%
{n/2}},&\mbox{$n$ even.}\end{cases}\]