O.g.f.: Sum_{n>=0} 4*(n+4)^(n-1) * x^n / Product_{k=1..n} (1+k*x).
A196557
O.g.f.: Sum_{n>=0} 4*(n+4)^(n-1) * x^n / Product_{k=1..n} (1+k*x).
Terms
- a(0) =1a(1) =4a(2) =20a(3) =128a(4) =1036a(5) =10308a(6) =122560a(7) =1701092a(8) =27053556a(9) =485683128a(10) =9723771156a(11) =214934627476
External references
- oeis: A196557