O.g.f.: Sum_{n>=0} 4*(n+4)^(n-1)*x^n/(1+n*x)^n.
A195256
O.g.f.: Sum_{n>=0} 4*(n+4)^(n-1)*x^n/(1+n*x)^n.
Terms
- a(0) =1a(1) =4a(2) =20a(3) =104a(4) =568a(5) =3296a(6) =20576a(7) =139840a(8) =1044416a(9) =8617472a(10) =78605824a(11) =790252544a(12) =8709555200a(13) =104581771264
External references
- oeis: A195256