a(n) = (product of previous terms) * (sum of previous terms), with a(1)=1, a(2)=4.
A217369
a(n) = (product of previous terms) * (sum of previous terms), with a(1)=1, a(2)=4.
Terms
- a(0) =1a(1) =4a(2) =20a(3) =2000a(4) =324000000
External references
- oeis: A217369