F23⁡(-n,b,c1-b-n,1-c-n;1)={0,n=2⁢k+1,(2⁢k)!⁢Γ⁡(b+k)⁢Γ⁡(c+k)⁢Γ⁡(b+c+2⁢k)k!⁢Γ⁡(b+2⁢k)⁢Γ⁡(c+2⁢k)⁢Γ⁡(b+c+k),n=2⁢k,