O.g.f.: Sum_{n>=0} 2*(n+2)^(n-1)*x^n/(1+n*x)^n.
A195254
O.g.f.: Sum_{n>=0} 2*(n+2)^(n-1)*x^n/(1+n*x)^n.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =20a(4) =76a(5) =336a(6) =1744a(7) =10592a(8) =74400a(9) =595712a(10) =5362432a(11) =53626368a(12) =589894144a(13) =7078737920a(14) =92023609344
External references
- oeis: A195254