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

A384029

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

Terms

    a(0) =1a(1) =0a(2) =6a(3) =180a(4) =7206a(5) =370880a(6) =23477380a(7) =1768061064a(8) =154544373158

External references