a(n) = [x^n] Product_{k=0..n-1} (1 + k*x)^3.
A384018
a(n) = [x^n] Product_{k=0..n-1} (1 + k*x)^3.
Terms
- a(0) =1a(1) =0a(2) =3a(3) =63a(4) =1767a(5) =63690a(6) =2822740a(7) =148810032a(8) =9104502015a(9) =634448680884
External references
- oeis: A384018