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

A384060

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

Terms

    a(0) =1a(1) =4a(2) =82a(3) =3024a(4) =162154a(5) =11438280a(6) =1001454024a(7) =104777127616

External references