a(n) = [x^(2*n)] Product_{k=0..n-1} (1 + k*x)^4.

A384030

a(n) = [x^(2*n)] Product_{k=0..n-1} (1 + k*x)^4.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =248a(4) =79441a(5) =38878520a(6) =27741179521

External references