a(n) = Sum_{k=0..n} binomial(n, k)*2^(n^2-k*(n-k)).

A360820

a(n) = Sum_{k=0..n} binomial(n, k)*2^(n^2-k*(n-k)).

Terms

    a(0) =1a(1) =4a(2) =48a(3) =1792a(4) =221184a(5) =98566144a(6) =173946175488

External references