sum[(-1)^(n-k) *binom(n,k) *2^k (pochhammer(a,k-1)/pochhammer(1,k-1))^7,{k,0,n}]sum[(-1)^(n-k) *binom(n,k) *2^k (pochhammer(a,k-1)/pochhammer(1,k-1))^7,{k,0,n}]

• Natural Language
• Math Input