a(n) = Sum_{k=0..n} binomial(n,k) * ( binomial(n,k) - binomial(n,k-1) )^6.

A382446

a(n) = Sum_{k=0..n} binomial(n,k) * ( binomial(n,k) - binomial(n,k-1) )^6.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =257a(4) =4286a(5) =258952a(6) =11816512a(7) =632854273a(8) =43732565914

External references