a(0)=0, a(1)=1, a(n)=2*n*(a(n-1)+a(n-2)), n>1.
A179540
a(0)=0, a(1)=1, a(n)=2*n*(a(n-1)+a(n-2)), n>1.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =30a(4) =272a(5) =3020a(6) =39504a(7) =595336a(8) =10157440a(9) =193549968a(10) =4074148160a(11) =93889358816
External references
- oeis: A179540