An⁡(z)=∑s=0n(-n)s⁢(n+1)s⁢(a)s⁢(b)s(a+1)s⁢(b+1)s⁢(n!)2⁢F33⁡(-n+s,n+1+s,11+s,a+1+s,b+1+s;-z),